Disclosed
CVE-2026-6772
Incorrect boundary conditions 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.
Exploitation Probability (EPSS)
Low Priority0.05%
The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.
0% (Theoretical)100% (Certainty)
7-Day Exploitation Trend
Vulnerability Timeline
2 eventsApr 21, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.
Apr 22, 2026
Last Updated
Record updated with new analysis or tags.
Threat Actor Attribution
PREMIUM INTELAssociated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes
Remediation & Mitigation
SOLUTIONOfficial patches and mitigation steps are available for this vulnerability.
# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
Affected Products
2 Total
mozilla/firefoxAll Versions
mozilla/thunderbirdAll Versions
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2026089Mozilla
Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/Mozilla
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-31/Mozilla
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-32/Mozilla
Vendor Advisory
Am I Vulnerable?
Check your domain or package.json for CVE-2026-6772 exposure.
Vulnerability Details
CVSS Base Score
7.5/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published Date
Apr 21, 2026
Last Modified
Apr 22, 2026
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