Unrated severityNVD Advisory· Published Sep 1, 2026

CVE-2026-84143

Description

Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.

Affected products

Mozilla Corporation/Firefoxllm-fuzzy
Range: <155, <153.2, <140.15

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/buglist.cginvd
bugzilla.mozilla.org/buglist.cginvd
bugzilla.mozilla.org/show_bug.cginvd
www.mozilla.org/security/advisories/mfsa2026-82/nvd
www.mozilla.org/security/advisories/mfsa2026-84/nvd
www.mozilla.org/security/advisories/mfsa2026-85/nvd

News mentions

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