CVE-2026-4726

Description

Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1955311
• https://www.mozilla.org/security/advisories/mfsa2026-20/
• https://www.mozilla.org/security/advisories/mfsa2026-23/