Unrated severityNVD Advisory· Published Aug 18, 2026· Updated Aug 18, 2026

CVE-2026-74990

Description

Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. 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 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

Affected products

Mozilla Corporation/Firefoxllm-fuzzy
Range: 115.38, 140.13, 153.0

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/buglist.cginvd
bugzilla.mozilla.org/buglist.cginvd
www.mozilla.org/security/advisories/mfsa2026-74/nvd
www.mozilla.org/security/advisories/mfsa2026-75/nvd
www.mozilla.org/security/advisories/mfsa2026-76/nvd
www.mozilla.org/security/advisories/mfsa2026-77/nvd

News mentions

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