CVE-2026-109719

MEDIUM

Published Oct 13, 2026 Modified Oct 13, 2026 CWE-362 CWE-416

Description

Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

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CVSS v3.1 Score

4.2

MEDIUM

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

EPSS — Exploit Prediction

0.0017

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-362 CWE-362

CWE-416 Use After Free

References

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2073969 https://www.mozilla.org/security/advisories/mfsa2026-106/ https://www.mozilla.org/security/advisories/mfsa2026-107/ https://www.mozilla.org/security/advisories/mfsa2026-108/ https://www.mozilla.org/security/advisories/mfsa2026-109/ https://www.mozilla.org/security/advisories/mfsa2026-110/

Frequently Asked Questions

What is CVE-2026-109719? +

Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. It has a CVSS v3.1 base score of 4.2 (MEDIUM).

How severe is CVE-2026-109719? +

CVE-2026-109719 has a CVSS v3.1 score of 4.2 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0017, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-109719? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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