Vulnerable Library - jekyll-3.7.4.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Vulnerabilities
| Vulnerability |
Severity |
 CVSS |
Dependency |
Type |
Fixed in (jekyll version) |
Remediation Possible** |
| CVE-2021-28834 |
 Critical |
9.8 |
kramdown-1.17.0.gem |
Transitive |
N/A* |
❌ |
| CVE-2020-14001 |
Critical |
9.8 |
kramdown-1.17.0.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-54904 |
 High |
7.5 |
concurrent-ruby-1.1.3.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-35611 |
High |
7.5 |
addressable-2.8.0.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-54905 |
 Medium |
5.3 |
concurrent-ruby-1.1.3.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-54906 |
Medium |
4.0 |
concurrent-ruby-1.1.3.gem |
Transitive |
N/A* |
❌ |
*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2021-28834
Vulnerable Library - kramdown-1.17.0.gem
kramdown is yet-another-markdown-parser but fast, pure Ruby,
using a strict syntax definition and supporting several common extensions.
Library home page: https://rubygems.org/gems/kramdown-1.17.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/kramdown-1.17.0.gem
Dependency Hierarchy:
- jekyll-3.7.4.gem (Root Library)
- ❌ kramdown-1.17.0.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.
Publish Date: 2021-03-19
URL: CVE-2021-28834
CVSS 3 Score Details (9.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-52p9-v744-mwjj
Release Date: 2021-03-19
Fix Resolution: kramdown - 2.3.1
Step up your Open Source Security Game with Mend here
CVE-2020-14001
Vulnerable Library - kramdown-1.17.0.gem
kramdown is yet-another-markdown-parser but fast, pure Ruby,
using a strict syntax definition and supporting several common extensions.
Library home page: https://rubygems.org/gems/kramdown-1.17.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/kramdown-1.17.0.gem
Dependency Hierarchy:
- jekyll-3.7.4.gem (Root Library)
- ❌ kramdown-1.17.0.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
The kramdown gem before 2.3.0 for Ruby processes the template option inside Kramdown documents by default, which allows unintended read access (such as template="/etc/passwd") or unintended embedded Ruby code execution (such as a string that begins with template="string://<%= `). NOTE: kramdown is used in Jekyll, GitLab Pages, GitHub Pages, and Thredded Forum.
Publish Date: 2020-07-17
URL: CVE-2020-14001
CVSS 3 Score Details (9.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14001
Release Date: 2020-07-17
Fix Resolution: kramdown - 2.3.0
Step up your Open Source Security Game with Mend here
CVE-2026-54904
Vulnerable Library - concurrent-ruby-1.1.3.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more.
Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.1.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Dependency Hierarchy:
- jekyll-3.7.4.gem (Root Library)
- i18n-0.9.5.gem
- ❌ concurrent-ruby-1.1.3.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until compare_and_set(old_value, new_value) succeeds; Numeric compare_and_set, which checks old == old_value before attempting the underlying atomic swap.; and Ruby NaN semantics, where Float::NAN == Float::NAN is always false. As a result, once an AtomicReference contains Float::NAN, calling #update repeatedly evaluates the caller's block and never returns. In services that store externally derived numeric values in an AtomicReference, this can cause CPU exhaustion or permanent request/job hangs. This vulnerability is fixed in 1.3.7.
Publish Date: 2026-06-24
URL: CVE-2026-54904
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
Step up your Open Source Security Game with Mend here
CVE-2026-35611
Vulnerable Library - addressable-2.8.0.gem
Addressable is an alternative implementation to the URI implementation that is
part of Ruby's standard library. It is flexible, offers heuristic parsing, and
additionally provides extensive support for IRIs and URI templates.
Library home page: https://rubygems.org/gems/addressable-2.8.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/addressable-2.8.0.gem
Dependency Hierarchy:
- jekyll-3.7.4.gem (Root Library)
- ❌ addressable-2.8.0.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 to before 2.9.0, within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking. Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {&var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI. Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables. When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. This vulnerability is fixed in 2.9.0.
Publish Date: 2026-04-07
URL: CVE-2026-35611
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Release Date: 2026-04-07
Fix Resolution: https://github.com/sporkmonger/addressable.git - addressable-2.9.0
Step up your Open Source Security Game with Mend here
CVE-2026-54905
Vulnerable Library - concurrent-ruby-1.1.3.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more.
Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.1.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Dependency Hierarchy:
- jekyll-3.7.4.gem (Root Library)
- i18n-0.9.5.gem
- ❌ concurrent-ruby-1.1.3.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReentrantReadWriteLock can incorrectly grant a write lock after one thread acquires the read lock 32,768 times. The lock stores a thread's local read and write hold counts in one integer. The low 15 bits are used for the read hold count, and bit 15 is used as WRITE_LOCK_HELD. After 32,768 reentrant read acquisitions, the local read count crosses into the write-lock bit. try_write_lock then treats the thread as already holding a write lock and returns true without setting the global RUNNING_WRITER bit. This breaks the core mutual-exclusion guarantee: the caller is told it has a write lock, but other threads can still hold or acquire read locks at the same time. This vulnerability is fixed in 1.3.7.
Publish Date: 2026-06-24
URL: CVE-2026-54905
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Local
- Attack Complexity: Low
- Privileges Required: Low
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: Low
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
Step up your Open Source Security Game with Mend here
CVE-2026-54906
Vulnerable Library - concurrent-ruby-1.1.3.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more.
Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.1.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Dependency Hierarchy:
- jekyll-3.7.4.gem (Root Library)
- i18n-0.9.5.gem
- ❌ concurrent-ruby-1.1.3.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReadWriteLock#release_write_lock does not verify that the calling thread acquired the write lock. Any thread with access to the lock object can release an active write lock held by another thread. A second writer can then enter its critical section while the first writer is still running. Concurrent::ReadWriteLock#release_read_lock also decrements the shared counter even when no read lock is held. Calling it on a fresh lock changes the counter from 0 to -1, after which normal read acquisition raises Concurrent::ResourceLimitError. This is a synchronization correctness issue in the public Concurrent::ReadWriteLock API. This vulnerability is fixed in 1.3.7.
Publish Date: 2026-06-24
URL: CVE-2026-54906
CVSS 3 Score Details (4.0)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Local
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: Low
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
Step up your Open Source Security Game with Mend here
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Vulnerabilities
*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
Vulnerable Library - kramdown-1.17.0.gem
kramdown is yet-another-markdown-parser but fast, pure Ruby, using a strict syntax definition and supporting several common extensions.
Library home page: https://rubygems.org/gems/kramdown-1.17.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/kramdown-1.17.0.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.
Publish Date: 2021-03-19
URL: CVE-2021-28834
CVSS 3 Score Details (9.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-52p9-v744-mwjj
Release Date: 2021-03-19
Fix Resolution: kramdown - 2.3.1
Step up your Open Source Security Game with Mend here
Vulnerable Library - kramdown-1.17.0.gem
kramdown is yet-another-markdown-parser but fast, pure Ruby, using a strict syntax definition and supporting several common extensions.
Library home page: https://rubygems.org/gems/kramdown-1.17.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/kramdown-1.17.0.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
The kramdown gem before 2.3.0 for Ruby processes the template option inside Kramdown documents by default, which allows unintended read access (such as template="/etc/passwd") or unintended embedded Ruby code execution (such as a string that begins with template="string://<%= `). NOTE: kramdown is used in Jekyll, GitLab Pages, GitHub Pages, and Thredded Forum.
Publish Date: 2020-07-17
URL: CVE-2020-14001
CVSS 3 Score Details (9.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14001
Release Date: 2020-07-17
Fix Resolution: kramdown - 2.3.0
Step up your Open Source Security Game with Mend here
Vulnerable Library - concurrent-ruby-1.1.3.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.1.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until compare_and_set(old_value, new_value) succeeds; Numeric compare_and_set, which checks old == old_value before attempting the underlying atomic swap.; and Ruby NaN semantics, where Float::NAN == Float::NAN is always false. As a result, once an AtomicReference contains Float::NAN, calling #update repeatedly evaluates the caller's block and never returns. In services that store externally derived numeric values in an AtomicReference, this can cause CPU exhaustion or permanent request/job hangs. This vulnerability is fixed in 1.3.7.
Publish Date: 2026-06-24
URL: CVE-2026-54904
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
Step up your Open Source Security Game with Mend here
Vulnerable Library - addressable-2.8.0.gem
Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. It is flexible, offers heuristic parsing, and additionally provides extensive support for IRIs and URI templates.
Library home page: https://rubygems.org/gems/addressable-2.8.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/addressable-2.8.0.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 to before 2.9.0, within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking. Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {&var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI. Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables. When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. This vulnerability is fixed in 2.9.0.
Publish Date: 2026-04-07
URL: CVE-2026-35611
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Release Date: 2026-04-07
Fix Resolution: https://github.com/sporkmonger/addressable.git - addressable-2.9.0
Step up your Open Source Security Game with Mend here
Vulnerable Library - concurrent-ruby-1.1.3.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.1.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReentrantReadWriteLock can incorrectly grant a write lock after one thread acquires the read lock 32,768 times. The lock stores a thread's local read and write hold counts in one integer. The low 15 bits are used for the read hold count, and bit 15 is used as WRITE_LOCK_HELD. After 32,768 reentrant read acquisitions, the local read count crosses into the write-lock bit. try_write_lock then treats the thread as already holding a write lock and returns true without setting the global RUNNING_WRITER bit. This breaks the core mutual-exclusion guarantee: the caller is told it has a write lock, but other threads can still hold or acquire read locks at the same time. This vulnerability is fixed in 1.3.7.
Publish Date: 2026-06-24
URL: CVE-2026-54905
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Local
- Attack Complexity: Low
- Privileges Required: Low
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: Low
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
Step up your Open Source Security Game with Mend here
Vulnerable Library - concurrent-ruby-1.1.3.gem
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
Library home page: https://rubygems.org/gems/concurrent-ruby-1.1.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /home/wss-scanner/.gem/ruby/3.2.0/cache/concurrent-ruby-1.1.3.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReadWriteLock#release_write_lock does not verify that the calling thread acquired the write lock. Any thread with access to the lock object can release an active write lock held by another thread. A second writer can then enter its critical section while the first writer is still running. Concurrent::ReadWriteLock#release_read_lock also decrements the shared counter even when no read lock is held. Calling it on a fresh lock changes the counter from 0 to -1, after which normal read acquisition raises Concurrent::ResourceLimitError. This is a synchronization correctness issue in the public Concurrent::ReadWriteLock API. This vulnerability is fixed in 1.3.7.
Publish Date: 2026-06-24
URL: CVE-2026-54906
CVSS 3 Score Details (4.0)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Local
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: Low
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Release Date: 2026-06-19
Fix Resolution: https://github.com/ruby-concurrency/concurrent-ruby.git - v1.3.7
Step up your Open Source Security Game with Mend here