CVE-2026-12327

Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011842%2C2023902%2C2025512%2C2027312%2C2029444%2C2036571%2C2036900%2C2036936%2C2037995%2C2038551%2C2040717%2C2042724	Broken Link
https://www.mozilla.org/security/advisories/mfsa2026-57/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-58/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-60/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-61/	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:firefox:::::-:::*
	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:thunderbird:::::-:::*
	cpe:2.3:a:mozilla:thunderbird:::::esr:::*

History

26 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) Errores de seguridad de memoria presentes en Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 y Thunderbird 151. Algunos de estos errores mostraron evidencia de corrupción de memoria y presumimos que, con suficiente esfuerzo, algunos de estos podrían haber sido explotados para ejecutar código arbitrario. Esta vulnerabilidad fue corregida en Firefox 152, Firefox ESR 140.12, Thunderbird 152 y Thunderbird 140.12.

Information

Published : 2026-06-16 13:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-12327

Mitre link : CVE-2026-12327

CVE.ORG link : CVE-2026-12327

JSON object : View

Products Affected

mozilla

firefox
thunderbird

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

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