CVE-2026-7323

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

CVSS v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028537%2C2029911%2C2031121%2C2033602	Broken Link
https://www.mozilla.org/security/advisories/mfsa2026-35/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-36/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-38/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-39/	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:thunderbird:::::esr:::*
	cpe:2.3:a:mozilla:thunderbird:::::-:::*

History

30 Apr 2026, 18:38

Type	Values Removed	Values Added
CPE		cpe:2.3:a:mozilla:firefox:::::-:::* cpe:2.3:a:mozilla:thunderbird:::::-:::* cpe:2.3:a:mozilla:thunderbird:::::esr:::* cpe:2.3:a:mozilla:firefox:::::esr:::*
First Time		Mozilla Mozilla firefox Mozilla thunderbird
References	~~() https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028537%2C2029911%2C2031121%2C2033602 -~~	() https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028537%2C2029911%2C2031121%2C2033602 - Broken Link
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-35/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-35/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-36/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-36/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-38/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-38/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-39/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-39/ - Vendor Advisory

30 Apr 2026, 18:16

Type	Values Removed	Values Added
References		() https://www.mozilla.org/security/advisories/mfsa2026-38/ - () https://www.mozilla.org/security/advisories/mfsa2026-39/ -
Summary	(en) Memory safety bugs present in Firefox ESR 140.10.0 and Firefox 150.0.0. 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 150.0.1 and Firefox ESR 140.10.1.	(en) Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

28 Apr 2026, 22:16

Type	Values Removed	Values Added
Summary	(en) Memory safety bugs present in Firefox ESR 140.10.0, Thunderbird ESR 140.10.0, Firefox 150.0.0 and Thunderbird 150.0.0. 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 150.0.1 and Firefox ESR 140.10.1.	(en) Memory safety bugs present in Firefox ESR 140.10.0 and Firefox 150.0.0. 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 150.0.1 and Firefox ESR 140.10.1.

28 Apr 2026, 19:37

Type	Values Removed	Values Added
CWE		CWE-119 CWE-787
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.3

28 Apr 2026, 15:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-28 15:16

Updated : 2026-04-30 18:38

NVD link : CVE-2026-7323

Mitre link : CVE-2026-7323

CVE.ORG link : CVE-2026-7323

JSON object : View

Products Affected

mozilla

thunderbird
firefox

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-787

Out-of-bounds Write

7.3 /10