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Severe memory regression in V1

bugSomething isn't workingSomething isn't working

Status: Open.

#2048 In facebook/hermes;

· rodperottoni opened on Jun 5, 2026

[Security] BCProvider: unvalidated getLargeHeaderOffset() enables heap OOB read in bytecode parsing

Status: Open.

#2023 In facebook/hermes;

· evilgensec opened on May 16, 2026

Intl.NumberFormat unit style formats day/hour/minute as seconds on Hermes

Status: Open.

#2011 In facebook/hermes;

· safaiyeh opened on May 8, 2026

shermes native compilation fails on Windows (with Clang)

enhancementNew feature or requestNew feature or request

Status: Open.

#1994 In facebook/hermes;

· louisvangeldrop opened on Apr 23, 2026

--commonjs option is broken

bugSomething isn't workingSomething isn't working

Status: Open.

#1990 In facebook/hermes;

· davidlie opened on Apr 18, 2026

ReferenceError when accessing catch binding inside setTimeout callback

need-reproPotentially valid, but blocked on missing test case to reproducePotentially valid, but blocked on missing test case to reproduce

Status: Open.

#1969 In facebook/hermes;

· exo-egor opened on Apr 3, 2026

Support for native coverage data reporting

enhancementNew feature or requestNew feature or request

Status: Open.

#1937 In facebook/hermes;

· rsouthgate opened on Mar 12, 2026

Intl.NumberFormat.format() throws "Cannot convert BigInt to number" when passed a bigint on Android

bugSomething isn't workingSomething isn't working

Status: Open.

#1928 In facebook/hermes;

· brien-crean opened on Mar 4, 2026

All Meta changes coming from the internal code must pass the PR validation

enhancementNew feature or requestNew feature or request

Status: Open.

#1924 In facebook/hermes;

· vmoroz opened on Mar 2, 2026

~1MB increase in size

bugSomething isn't workingSomething isn't working

Status: Open.

#1920 In facebook/hermes;

· tux2nicolae opened on Feb 27, 2026

uint64_t underflow inside Array::arrayPrototypeSplice

bugSomething isn't workingSomething isn't working

Status: Open.

#1912 In facebook/hermes;

· farwayer opened on Feb 21, 2026

defineProperty proxy hook is not called for Array length

bugSomething isn't workingSomething isn't working

Status: Open.

#1910 In facebook/hermes;

· farwayer opened on Feb 20, 2026