CVE record · CVE-2022-26486

Use after free in Mozilla Firefox and others

CVSS 9.6 CriticalCriticalIn CISA KEVEPSS 0.024 · 83rd percentile

Critical, because:

In CISA’s KEV catalogue since 7 Mar 2022: it is known to be exploited.
CVSS score 9.6: 9.0 or more.

Published by the CVE Program (CNA: mozilla) at 22 Dec 2022, 00:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Mozilla	Firefox	affected unspecified to before 97.0.2 custom
Mozilla	Firefox ESR	affected unspecified to before 91.6.1 custom
Mozilla	Firefox for Android	affected unspecified to before 97.3.0 custom
Mozilla	Thunderbird	affected unspecified to before 91.6.2 custom
Mozilla	Focus	affected unspecified to before 97.3.0 custom

Identifiers: CVE-2022-26486
CNA: mozilla
Weakness (CWE): CWE-416
Tags: Mozilla Firefox
Mozilla Firefox ESR
Mozilla Firefox for Android
Mozilla Thunderbird
Mozilla Focus
Memory corruption
Published: 22 Dec 2022
Updated: 21 Oct 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.6	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	ADP (CISA-ADP)

CISA KEV Listed since 7 Mar 2022: known to be exploited.
EPSS 0.024, the 83rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 22 Dec 2022. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.