CVE-2026-6749: Vulnerability in Mozilla Firefox
Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
AI Analysis
Technical Summary
CVE-2026-6749 is an information disclosure vulnerability resulting from uninitialized memory usage in the Graphics: Canvas2D component of Mozilla Firefox. This flaw could allow an attacker to access sensitive information from memory that was not properly cleared or initialized. The vulnerability affects Firefox versions prior to 150 and ESR versions prior to 115.35 and 140.10. Mozilla addressed this issue in their April 2026 security advisories (MFSA 2026-30 and MFSA 2026-31) as part of a broader set of memory safety fixes. The vendor classifies the impact as high and has released official patches.
Potential Impact
The vulnerability allows information disclosure through uninitialized memory in the Canvas2D graphics component, which could lead to exposure of sensitive data. Mozilla rates the impact as high. There are no reports of active exploitation in the wild. The issue is resolved in Firefox 150 and ESR versions 115.35 and 140.10.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. Users and administrators should update to these versions or later to remediate the issue. Since the vulnerability is patched, no additional mitigation steps are required beyond applying the official updates.
CVE-2026-6749: Vulnerability in Mozilla Firefox
Description
Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6749 is an information disclosure vulnerability resulting from uninitialized memory usage in the Graphics: Canvas2D component of Mozilla Firefox. This flaw could allow an attacker to access sensitive information from memory that was not properly cleared or initialized. The vulnerability affects Firefox versions prior to 150 and ESR versions prior to 115.35 and 140.10. Mozilla addressed this issue in their April 2026 security advisories (MFSA 2026-30 and MFSA 2026-31) as part of a broader set of memory safety fixes. The vendor classifies the impact as high and has released official patches.
Potential Impact
The vulnerability allows information disclosure through uninitialized memory in the Canvas2D graphics component, which could lead to exposure of sensitive data. Mozilla rates the impact as high. There are no reports of active exploitation in the wild. The issue is resolved in Firefox 150 and ESR versions 115.35 and 140.10.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. Users and administrators should update to these versions or later to remediate the issue. Since the vulnerability is patched, no additional mitigation steps are required beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-04-21T12:40:46.464Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-30/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-31/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-32/","vendor":"Mozilla"}]
Threat ID: 69e7789819fe3cd2cdd16251
Added to database: 4/21/2026, 1:16:08 PM
Last enriched: 4/21/2026, 1:47:25 PM
Last updated: 4/22/2026, 7:17:01 AM
Views: 12
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