CVE-2026-4685: Vulnerability in Mozilla Firefox
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
AI Analysis
Technical Summary
CVE-2026-4685 addresses incorrect boundary conditions in the Graphics: Canvas2D component of Mozilla Firefox. This vulnerability can cause memory safety issues that impact application availability. It was reported by Sajeeb Lohani and fixed in Firefox 149 and Firefox ESR 115.34. The CVSS v3.1 base score is 7.5 (high), with an attack vector of network, low attack complexity, no privileges required, no user interaction, and impact limited to availability. The vendor advisory confirms the fix availability in the stated versions. There are no known exploits in the wild for this vulnerability.
Potential Impact
The vulnerability can cause denial-of-service conditions by impacting the availability of Firefox through memory safety issues in the Canvas2D graphics component. There is no confirmed impact on confidentiality or integrity. Exploitation does not require privileges or user interaction, making it potentially reachable remotely. However, no active exploitation has been observed.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 149 and Firefox ESR 115.34. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue. No additional mitigation actions are specified by the vendor.
CVE-2026-4685: Vulnerability in Mozilla Firefox
Description
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-4685 addresses incorrect boundary conditions in the Graphics: Canvas2D component of Mozilla Firefox. This vulnerability can cause memory safety issues that impact application availability. It was reported by Sajeeb Lohani and fixed in Firefox 149 and Firefox ESR 115.34. The CVSS v3.1 base score is 7.5 (high), with an attack vector of network, low attack complexity, no privileges required, no user interaction, and impact limited to availability. The vendor advisory confirms the fix availability in the stated versions. There are no known exploits in the wild for this vulnerability.
Potential Impact
The vulnerability can cause denial-of-service conditions by impacting the availability of Firefox through memory safety issues in the Canvas2D graphics component. There is no confirmed impact on confidentiality or integrity. Exploitation does not require privileges or user interaction, making it potentially reachable remotely. However, no active exploitation has been observed.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 149 and Firefox ESR 115.34. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue. No additional mitigation actions are specified by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-03-23T23:21:31.793Z
- Cvss Version
- null
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-20/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-21/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-22/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-23/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-24/","vendor":"Mozilla"}]
Threat ID: 69c28782f4197a8e3b32054d
Added to database: 03/24/2026, 12:45:54 UTC
Last enriched: 07/15/2026, 09:26:59 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 132
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