VULNERABILITY INTELLIGENCE

CVE-2025-40829

CVSS score7.8 HIGH

EPSS probability0.46%

CISA KEVNot currently listed

Published2025-12-12

Last modified2026-10-23

Description

Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges. *This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.