CVE-2026-6767: Vulnerability in Mozilla Firefox
Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
AI Analysis
Technical Summary
CVE-2026-6767 is a vulnerability in the NSS Libraries component used by Mozilla Firefox and Thunderbird. It is categorized as an 'Other issue' with a CVSS v3.1 base score of 5.3 (medium severity), indicating a network attack vector with low complexity and no privileges or user interaction required, impacting confidentiality only. The vulnerability was resolved in Firefox 150 and ESR versions 115.35 and 140.10, as well as corresponding Thunderbird versions. The Mozilla advisories confirm the fix and include this vulnerability among multiple memory safety bugs addressed in these releases.
Potential Impact
The vulnerability could potentially lead to limited confidentiality impact due to the nature of the issue in NSS libraries. There is no indication of integrity or availability impact. No known exploits have been observed in the wild. The fix in Firefox 150 and ESR versions mitigates the risk.
Mitigation Recommendations
Users and administrators should upgrade to Firefox 150, Firefox ESR 115.35 or 140.10, Thunderbird 150, or Thunderbird 140.10 to remediate this vulnerability. The vendor has released official fixes, and applying these updates fully addresses the issue. No additional mitigation actions are required beyond updating to the fixed versions.
CVE-2026-6767: Vulnerability in Mozilla Firefox
Description
Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6767 is a vulnerability in the NSS Libraries component used by Mozilla Firefox and Thunderbird. It is categorized as an 'Other issue' with a CVSS v3.1 base score of 5.3 (medium severity), indicating a network attack vector with low complexity and no privileges or user interaction required, impacting confidentiality only. The vulnerability was resolved in Firefox 150 and ESR versions 115.35 and 140.10, as well as corresponding Thunderbird versions. The Mozilla advisories confirm the fix and include this vulnerability among multiple memory safety bugs addressed in these releases.
Potential Impact
The vulnerability could potentially lead to limited confidentiality impact due to the nature of the issue in NSS libraries. There is no indication of integrity or availability impact. No known exploits have been observed in the wild. The fix in Firefox 150 and ESR versions mitigates the risk.
Mitigation Recommendations
Users and administrators should upgrade to Firefox 150, Firefox ESR 115.35 or 140.10, Thunderbird 150, or Thunderbird 140.10 to remediate this vulnerability. The vendor has released official fixes, and applying these updates fully addresses the issue. No additional mitigation actions are required beyond updating to the fixed versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-04-21T12:40:59.989Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-30/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-31/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-32/","vendor":"Mozilla"}]
Threat ID: 69e7789e19fe3cd2cdd164a7
Added to database: 4/21/2026, 1:16:14 PM
Last enriched: 5/27/2026, 7:59:18 PM
Last updated: 6/5/2026, 10:21:10 AM
Views: 59
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