CVE-2023-5728: Debian Linux

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

During garbage collection extra operations were performed on a object that should not be. This could have led to a potentially exploitable crash. This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• Mozilla Firefox: before 119.0 (fixed in 119.0)
• Mozilla Firefox ESR: before 115.4 (fixed in 115.4)
• Mozilla Thunderbird: before 115.4.1 (fixed in 115.4.1)

Published 2023-10-25. Last modified 2026-06-17.