CVE-2026-119332 Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-119332?
CVE-2026-119332 is a high-severity vulnerability in LadybirdBrowser ladybird, published on 30 Oct 2026.
Official description
Ladybird is a truly independent web browser. Prior to 209579c96473c75bd5eba9701fcadb841a045964, FinalizationRegistry::cleanup() in Libraries/LibJS/Runtime/FinalizationRegistry.cpp removed a dead record from m_records, retained an iterator to the next FinalizationRecord, and then invoked attacker-controlled JavaScript through the cleanup callback. If that callback called unregister() for the next record, remove_by_token() freed the node referenced by the retained iterator, and the next cleanup iteration read its target and held_value fields after free. This reliably crashes instrumented WebContent builds and creates a memory-corruption primitive in production builds. This vulnerability is fixed by commit 209579c96473c75bd5eba9701fcadb841a045964.
Weakness: CWE-416
Which versions are affected by CVE-2026-119332?
How do I fix CVE-2026-119332?
No fix has been published for CVE-2026-119332 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-119332 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-119332 exists.
Sources
Also known as GHSA-6cmv-xmff-qjph.