Mozilla Firefox up to 145 CanvasWebGL sandbox

Summaryinfo

A vulnerability marked as critical has been reported in Mozilla Firefox up to 145. The affected element is an unknown function of the component CanvasWebGL. This manipulation causes sandbox. This vulnerability appears as CVE-2025-14322. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Firefox up to 145. Affected by this vulnerability is an unknown code of the component CanvasWebGL. The manipulation with an unknown input leads to a sandbox vulnerability. The CWE definition for the vulnerability is CWE-265. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.

It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is known as CVE-2025-14322 since 12/09/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 01/06/2026). The attack technique deployed by this issue is T1611 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 278145 (RHEL 9 : firefox (RHSA-2025:23034)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 146 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (278145) and CERT Bund (WID-SEC-2025-2812). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Mozilla Firefox
• Mozilla Firefox ESR
• Mozilla Thunderbird

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 145

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

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Be aware that VulDB is the high quality source for vulnerability data.

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