CVE-2020-37239

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.

• https://www.exploit-db.com/exploits/49259
• https://www.gegl.org
• https://www.gegl.org/babl/
• https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety