Issues

• static_h: free() on a hoost fiber stack crashes bionic's frame-pointer walker (GWP-ASan RecordBacktrace) at the make_fcontext boundary

  facebook/hermes#2225 · Filter by author legwork-sh opened on Oct 7, 2026
  1

• TypedArray.from and new TypedArray(array) are ~6× slower since #1882 for plain arrays

  facebook/hermes#2215 · Filter by author tobisamuel opened on Sep 30, 2026
  1

• Request: cherry-pick 340e562c39 (OldGen::search dead-zone skip) into 250829098.0.0-stable (iOS JS thread stalls for minutes)

  facebook/hermes#2214 · Filter by author jasonbarrera-chlk opened on Sep 29, 2026

• Android DateTimeFormat reports h11/h24 but formats midnight as h12/h23

  facebook/hermes#2209 · Filter by author mozzius opened on Sep 26, 2026

• tryGetMutableBuffer() segfaults after another external ArrayBuffer gets a property

  facebook/hermes#2201 · Filter by author mrousavy opened on Sep 25, 2026

• Publish a Linux ARM64 (aarch64) hermesc binary in hermes-compiler

  facebook/hermes#2194 · Filter by author nnnnoel opened on Sep 23, 2026

• RN 0.88 ships without lazy-compilation fix

  bug
  facebook/hermes#2192 · Filter by author Nezz opened on Sep 23, 2026
  3

• Intermittent HadesGC OldGen corruption (EXC_BAD_ACCESS) correlated with low device memory, across unrelated RN app screens

  facebook/hermes#2190 · Filter by author db-flutterwave opened on Sep 18, 2026
  10

• static_h: an asmjit failure is an unconditional hermes_fatal, so a platform that refuses executable memory turns a JIT *request* into a dead process instead of an interpreted one

  facebook/hermes#2187 · Filter by author altween opened on Sep 17, 2026

• static_h: HERMESVM_ALLOW_JIT=1 means "enabled if supported by the platform", but support is resolved only from predefines — asmjit can answer it at run time

  facebook/hermes#2186 · Filter by author altween opened on Sep 17, 2026

• static_h: the sampling profiler has no build switch, so a target with no POSIX signal delivery has to stub sigaction / sigemptyset / pthread_kill for an instrument it cannot run

  facebook/hermes#2185 · Filter by author altween opened on Sep 17, 2026

• shermes emits GNU-style compile and link flags unconditionally, so its own default SHERMES_CC (= CMAKE_C_COMPILER = clang-cl) cannot link what it compiles on Windows

  facebook/hermes#2176 · Filter by author altween opened on Sep 7, 2026
  1

• lib/CMakeLists.txt passes /WHOLEARCHIVE:hermesvm_a as a bare name; lld-link cannot open it, so the shared hermesvm (and therefore shermes) does not link under clang-cl

  facebook/hermes#2175 · Filter by author altween opened on Sep 7, 2026
  1

• API/jsi/jsi/CMakeLists.txt tests CMAKE_CXX_COMPILER_ID MATCHES "MSVC", so clang-cl gets neither branch's flags

  facebook/hermes#2174 · Filter by author altween opened on Sep 7, 2026
  1

• static_h: the tree cannot be compiled with clang-cl — CMake's /EHsc is stripped and hermes_update_cxx_flags replaces it with GCC spellings clang-cl ignores

  facebook/hermes#2173 · Filter by author altween opened on Sep 7, 2026
  1

• Date: a DST transition at local midnight makes setHours read back the wrong day

  facebook/hermes#2159 · Filter by author CSeal opened on Aug 27, 2026
  1

• hermes-parser: babel:true conversion is O(n^2) in sibling count — 88s on a file that parses in 0.1s

  facebook/hermes#2158 · Filter by author elirangoshen opened on Aug 27, 2026

• Assertion failure in VM/JSObject.h: "getParent cannot be used with proxy objects"

  bug
  facebook/hermes#2129 · Filter by author ericliuu opened on Aug 9, 2026
  1

• Assertion failure in IRGen/ESTreeIRGen-expr.cpp: "SemanticResolver must check super() is in a class with a superclass"

  bug
  facebook/hermes#2126 · Filter by author ericliuu opened on Aug 8, 2026
  1

• No-pthread Emscripten runtime throws during JSI finalization via SerialExecutor

  facebook/hermes#2125 · Filter by author leventov opened on Aug 5, 2026

• Severe memory regression in V1

  bug
  facebook/hermes#2048 · Filter by author rodperottoni opened on Jun 5, 2026
  19

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

  facebook/hermes#2023 · Filter by author evilgensec opened on May 16, 2026
  1

• --commonjs option is broken

  bug
  facebook/hermes#1990 · Filter by author davidlie opened on Apr 18, 2026
  1

  

• ReferenceError when accessing catch binding inside setTimeout callback

  need-repro
  facebook/hermes#1969 · Filter by author exo-egor opened on Apr 3, 2026
  11

• Support for native coverage data reporting

  enhancement
  facebook/hermes#1937 · Filter by author rsouthgate opened on Mar 12, 2026