The JIT created incorrect code for arguments in certain cases. This led to potential use-after-free crashes during garbage collection. This vulnerability affects Firefox < 125 and Firefox ESR < 115.10.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-3857
• https://bugzilla.mozilla.org/show_bug.cgi?id=1886683
• https://www.mozilla.org/security/advisories/mfsa2024-18
• https://www.mozilla.org/security/advisories/mfsa2024-19
• https://lists.debian.org/debian-lts-announce/2024/04/msg00012.html
• https://lists.debian.org/debian-lts-announce/2024/04/msg00013.html
• https://www.mozilla.org/security/advisories/mfsa2024-20