In some code patterns the JIT incorrectly optimized switch statements and generated code with out-of-bounds-reads. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.
bugzilla.mozilla.org/show_bug.cgi?id=1884552
lists.debian.org/debian-lts-announce/2024/04/msg00012.html
lists.debian.org/debian-lts-announce/2024/04/msg00013.html
www.mozilla.org/security/advisories/mfsa2024-18/
www.mozilla.org/security/advisories/mfsa2024-19/
www.mozilla.org/security/advisories/mfsa2024-20/