CVE-2026-2779

critical · 9.8

Incorrect boundary conditions in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

9.8

CVSS

0.6%

EPSS (exploit prob.)

48th

EPSS percentile

2026-02-24

Published

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

Weaknesses

CWE-119

Affected products

Vendor	Product	Affected versions
mozilla	firefox	< 140.8.0
mozilla	firefox	< 148.0
mozilla	thunderbird	< 140.8.0
mozilla	thunderbird	< 148.0

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

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1164141
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-15/
https://www.mozilla.org/security/advisories/mfsa2026-16/
https://www.mozilla.org/security/advisories/mfsa2026-17/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-2779