CVE-2026-2793

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-2793
Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

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=2015196%2C2016423%2C2016498 Broken Link
https://www.mozilla.org/security/advisories/mfsa2026-13/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-14/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-15/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-16/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-17/ 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:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
History

25 Feb 2026, 15:41

Type Values Removed Values Added
References () https://bugzilla.mozilla.org/buglist.cgi?bug_id=2015196%2C2016423%2C2016498 - () https://bugzilla.mozilla.org/buglist.cgi?bug_id=2015196%2C2016423%2C2016498 - Broken Link
References () https://www.mozilla.org/security/advisories/mfsa2026-13/ - () https://www.mozilla.org/security/advisories/mfsa2026-13/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-14/ - () https://www.mozilla.org/security/advisories/mfsa2026-14/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-15/ - () https://www.mozilla.org/security/advisories/mfsa2026-15/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-16/ - () https://www.mozilla.org/security/advisories/mfsa2026-16/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-17/ - () https://www.mozilla.org/security/advisories/mfsa2026-17/ - Vendor Advisory
CWE CWE-787
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.8
First Time Mozilla
Mozilla firefox
Mozilla thunderbird
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:*:*:*

24 Feb 2026, 18:29

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-16/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-17/ -
Summary (en) Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8. (en) Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

24 Feb 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-24 14:16

Updated : 2026-02-25 19:43

NVD link : CVE-2026-2793

Mitre link : CVE-2026-2793

CVE.ORG link : CVE-2026-2793

JSON object : View

Products Affected

mozilla

  • thunderbird
  • firefox
CWE
CWE-787

Out-of-bounds Write