CVE-2019-11693: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days.

The bufferdata function in WebGL is vulnerable to a buffer overflow with specific graphics drivers on Linux. This could result in malicious content freezing a tab or triggering a potentially exploitable crash. *Note: this issue only occurs on Linux. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

Affected products

• Mozilla Firefox: before 60.7.0 (fixed in 60.7.0); before 67.0 (fixed in 67.0)
• Mozilla Thunderbird: before 60.7.0 (fixed in 60.7.0)

Published 2019-07-23. Last modified 2026-06-17.