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URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6766

⇱ NVD - CVE-2026-6766

  1. Vulnerabilities

CVE-2026-6766 Detail

Description

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2023207 Mozilla Corporation Permissions Required 
https://www.mozilla.org/security/advisories/mfsa2026-30/ Mozilla Corporation Vendor Advisory 
https://www.mozilla.org/security/advisories/mfsa2026-32/ Mozilla Corporation Vendor Advisory 
https://www.mozilla.org/security/advisories/mfsa2026-33/ Mozilla Corporation Vendor Advisory 
https://www.mozilla.org/security/advisories/mfsa2026-34/ Mozilla Corporation Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-754 Improper Check for Unusual or Exceptional Conditions CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 7:01:17 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2026-04-21T16:37:26.876838Z","id":"CVE-2026-6766","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by Mozilla Corporation 6/17/2026 7:01:17 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"140.10","lessThanOrEqual":"140.*","versionType":"rpm","status":"unaffected"},{"version":"150","lessThanOrEqual":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.10","lessThanOrEqual":"140.*","versionType":"rpm","status":"unaffected"},{"version":"150","lessThanOrEqual":"*","versionType":"rpm","status":"unaffected"}]}]

Initial Analysis by NIST 4/22/2026 10:57:46 AM

Action Type Old Value New Value
Added CPE Configuration 
OR
 *cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 150.0
 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions up to (excluding) 140.10.0
 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* versions up to (excluding) 140.10.0
Added Reference Type 
Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=2023207 Types: Permissions Required
Added Reference Type 
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-30/ Types: Vendor Advisory
Added Reference Type 
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-32/ Types: Vendor Advisory
Added Reference Type 
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-33/ Types: Vendor Advisory
Added Reference Type 
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-34/ Types: Vendor Advisory

CVE Modified by Mozilla Corporation 4/21/2026 8:16:32 PM

Action Type Old Value New Value
Changed Description 
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.


 
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Added Reference 
https://www.mozilla.org/security/advisories/mfsa2026-33/
Added Reference 
https://www.mozilla.org/security/advisories/mfsa2026-34/

CVE Modified by CISA-ADP 4/21/2026 1:16:58 PM

Action Type Old Value New Value
Added CVSS V3.1 
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added CWE 
CWE-754

New CVE Received from Mozilla Corporation 4/21/2026 9:16:22 AM

Action Type Old Value New Value
Added Description 
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.
Added Reference 
https://bugzilla.mozilla.org/show_bug.cgi?id=2023207
Added Reference 
https://www.mozilla.org/security/advisories/mfsa2026-30/
Added Reference 
https://www.mozilla.org/security/advisories/mfsa2026-32/

Quick Info

CVE Dictionary Entry:
CVE-2026-6766
NVD Published Date:
04/21/2026
NVD Last Modified:
06/17/2026
Source:
Mozilla Corporation