CVE-2026-6749: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 115.35 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.10 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 150 - Upgrade
Upgrade
Firefox / Firefox ESR / Thunderbird (Graphics: Canvas2D)to a version that resolves this vulnerability.Fixed in 150 - Upgrade
Upgrade
Firefox ESR / Thunderbird (Graphics: Canvas2D)to a version that resolves this vulnerability.Fixed in 115.35 - Upgrade
Upgrade
Firefox ESR / Thunderbird (Graphics: Canvas2D)to a version that resolves this vulnerability.Fixed in 140.10
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-6746
- CVE-2026-6749
- CVE-2026-6750
- CVE-2026-6752
- CVE-2026-6754
- CVE-2026-2781
- CVE-2026-6762
- CVE-2026-6767
- CVE-2026-6772
- CVE-2026-6785
- CVE-2026-6747
- CVE-2026-6748
- CVE-2026-6751
- CVE-2026-6753
- CVE-2026-6757
- CVE-2026-6759
- CVE-2026-6761
- CVE-2026-6763
- CVE-2026-6764
- CVE-2026-6765
- CVE-2026-6766
- CVE-2026-6769
- CVE-2026-6770
- CVE-2026-6771
- CVE-2026-6776
- CVE-2026-6786
- CVE-2026-6755
- CVE-2026-6758
- CVE-2026-6760
- CVE-2026-6768
- CVE-2026-6773
- CVE-2026-6774
- CVE-2026-6775
- CVE-2026-6777
- CVE-2026-6778
- CVE-2026-6779
- CVE-2026-6780
- CVE-2026-6781
- CVE-2026-6782
- CVE-2026-6783
- CVE-2026-7321
- CVE-2026-8091
- CVE-2026-6784
- CVE-2026-6756
Frequently Asked Questions
What is the severity of CVE-2026-6749?
CVE-2026-6749 is classified as an information disclosure vulnerability.
How do I fix CVE-2026-6749?
To fix CVE-2026-6749, update to Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, or Thunderbird 140.10.
What types of software are affected by CVE-2026-6749?
CVE-2026-6749 affects Mozilla Firefox, Firefox ESR, and Thunderbird versions prior to the specified patched versions.
What is the root cause of CVE-2026-6749?
CVE-2026-6749 is caused by information disclosure due to uninitialized memory in the Graphics: Canvas2D component.
Is there a workaround for CVE-2026-6749?
There is no specific workaround for CVE-2026-6749; the recommended action is to update the affected software.