CVE-2020-37239: Gegl Libbabl

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety checks by exploiting signature overwriting in freed chunks. Attackers can call babl_free() twice on the same pointer without triggering detection, as libc's malloc metadata overwrites babl's signature field upon freeing, enabling potential memory corruption and code execution.

Affected products

• Gegl Libbabl: version 0.1.62 only

Published 2026-05-16. Last modified 2026-09-29.