CVE-2026-6749

Name: CVE-2026-6749
Creator: NVD / NIST
Published: 2026-04-21T13:16:20.993+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2026-6749 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.34%

25.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-908

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.35.0
Mozilla	Firefox	< 150.0
Mozilla	Firefox	>= 140.0, < 140.10.0
Mozilla	Thunderbird	< 140.10.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2022610Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-31/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-32/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-34/Vendor Advisory

Timeline

Published: Apr 21, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-6749?

How severe is CVE-2026-6749?

CVE-2026-6749 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-6749?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-6749?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST