Vulnerability record · CVE-2026-100782 · published 29 September 2026

CVE-2026-100782: Mozilla firefox memory buffer overflow vulnerability

Mozilla · Firefox

Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

8.8 CVSS 3.1 High EPSS 0.28% · top 81.8% CWE-119 · Memory buffer overflow

8.8CVSS 3.1 base score

0.28%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

8References

5 Oct 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Firefox Mozilla

Thunderbird Mozilla

References

Link	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2068456	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-100/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-101/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-102/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-103/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-97/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-98/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-99/	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-100782), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.