Vulnerability in Mozilla Firefox

[ Description ]Official description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR14 Oct 2026CERTFR-2026-AVI-1305

  Multiple vulnerabilities in Mozilla products Translated from French

  Multiple vulnerabilities have been discovered in Mozilla products. Some of them allow an attacker to cause privilege escalation, remote denial of service and a breach of data confidentiality.

  CVE-2026-109779CVE-2026-109710CVE-2026-109719+79 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3942

  Mozilla Firefox and Thunderbrid: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-109717CVE-2026-109781CVE-2026-109710+78 more CVEs

[ References ]References

• bugzilla.mozilla.org/show_bug.cgi
• www.mozilla.org/security/advisories/mfsa2026-106
• www.mozilla.org/security/advisories/mfsa2026-109