CVE-2026-2781

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-2781
Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2009552 Issue Tracking Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-13/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-15/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-16/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-17/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-31/
https://lists.debian.org/debian-lts-announce/2026/03/msg00012.html
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
History

21 Apr 2026, 13:16

Type Values Removed Values Added
Summary (en) Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. (en) Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-31/ -

13 Apr 2026, 15:17

Type Values Removed Values Added
Summary (en) Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. (en) Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

25 Mar 2026, 17:16

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2026/03/msg00012.html -
Summary
  • (es) Desbordamiento de entero en el componente de librerías en NSS. Esta vulnerabilidad afecta a Firefox &lt; 148, Firefox ESR &lt; 140.8, Thunderbird &lt; 148, y Thunderbird &lt; 140.8.

25 Feb 2026, 15:48

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
CWE CWE-190
First Time Mozilla
Mozilla firefox
Mozilla thunderbird
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.8
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2009552 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2009552 - Issue Tracking, Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-13/ - () https://www.mozilla.org/security/advisories/mfsa2026-13/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-15/ - () https://www.mozilla.org/security/advisories/mfsa2026-15/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-16/ - () https://www.mozilla.org/security/advisories/mfsa2026-16/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-17/ - () https://www.mozilla.org/security/advisories/mfsa2026-17/ - Vendor Advisory

24 Feb 2026, 18:29

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-16/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-17/ -
Summary (en) Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. (en) Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

24 Feb 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-24 14:16

Updated : 2026-04-21 13:16

NVD link : CVE-2026-2781

Mitre link : CVE-2026-2781

CVE.ORG link : CVE-2026-2781

JSON object : View

Products Affected

mozilla

  • firefox
  • thunderbird
CWE
CWE-190

Integer Overflow or Wraparound