Medium severity5.4NVD Advisory· Published Sep 1, 2026· Updated Sep 1, 2026

CVE-2026-84120

Description

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

Affected products

Mozilla Corporation/Firefoxllm-fuzzy
Range: up to 155, ESR 115.40, ESR 140.15, ESR 153.2

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/show_bug.cginvd
www.mozilla.org/security/advisories/mfsa2026-82/nvd
www.mozilla.org/security/advisories/mfsa2026-83/nvd
www.mozilla.org/security/advisories/mfsa2026-84/nvd
www.mozilla.org/security/advisories/mfsa2026-85/nvd

News mentions

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cvss	0.351
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000