CVE-2026-84121 | Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
- 🔗 bugzilla.mozilla.org/show_bug.cgi
- 🔗 www.mozilla.org/security/advisories/mfsa2026-82/
- 🔗 www.mozilla.org/security/advisories/mfsa2026-83/
- 🔗 www.mozilla.org/security/advisories/mfsa2026-84/
- 🔗 www.mozilla.org/security/advisories/mfsa2026-85/
- 🔗 www.mozilla.org/security/advisories/mfsa2026-86/
- 🔗 www.mozilla.org/security/advisories/mfsa2026-87/
- 🔗 www.mozilla.org/security/advisories/mfsa2026-88/
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CVE-2026-84121 | Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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