CVE-2026-0884

critical · 9.8

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

9.8

CVSS

0.5%

EPSS (exploit prob.)

40th

EPSS percentile

2026-01-13

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416

Affected products

Vendor	Product	Affected versions
mozilla	firefox	< 140.7.0
mozilla	firefox	< 147.0
mozilla	thunderbird	< 140.7.0
mozilla	thunderbird	< 147.0

Check a specific version with /api/v1/cve/match.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2003588
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-03/
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://www.mozilla.org/security/advisories/mfsa2026-05/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-0884