What is CVE-2026-84131?

CVE-2026-84131 is a high-severity vulnerability, classified under Release of Invalid Pointer or Reference. CVSS score: 8.8/10. Published 2026-09-01.

How severe is CVE-2026-84131?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-84131

CVE-2026-84131

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-763 — Release of Invalid Pointer or Reference

References

security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org

Frequently asked questions

What is CVE-2026-84131?: CVE-2026-84131 is a high-severity vulnerability, classified under Release of Invalid Pointer or Reference. CVSS score: 8.8/10. Published 2026-09-01.
How severe is CVE-2026-84131?: High severity. CVSS v3 base score is 8.8 out of 10.