AppendEncodedAttributeValue(), ExtraSpaceNeededForAttrEncoding() and AppendEncodedCharacters() could have experienced integer overflows, causing underallocation of an output buffer leading to an out of bounds write. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-2608
• https://bugzilla.mozilla.org/show_bug.cgi?id=1880692
• https://www.mozilla.org/security/advisories/mfsa2024-12
• https://www.mozilla.org/security/advisories/mfsa2024-13
• https://www.mozilla.org/security/advisories/mfsa2024-14
• https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
• https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html