CVE-2026-109707

CVSS 9.6 (critical) · published 2026-10-13

Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

Weakness: CWE-416

Source: NVD CVE-2026-109707

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2059150
• https://www.mozilla.org/security/advisories/mfsa2026-106/
• https://www.mozilla.org/security/advisories/mfsa2026-108/
• https://www.mozilla.org/security/advisories/mfsa2026-109/
• https://www.mozilla.org/security/advisories/mfsa2026-110/
• https://www.mozilla.org/security/advisories/mfsa2026-119/

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