{"id":"CVE-2020-37239","title":"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","summary":"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 witho…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-415"],"published":"2026-05-16","updated":"2026-09-29","sourceUpdated":"2026-09-29T10:10:00.263","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-37239","references":[{"url":"https://www.exploit-db.com/exploits/49259","label":"disclosure@vulncheck.com"},{"url":"https://www.gegl.org","label":"disclosure@vulncheck.com"},{"url":"https://www.gegl.org/babl/","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00459,"epssPercentile":0.37298,"ingestedAt":"2026-09-29T10:31:36.287Z","slug":"CVE-2020-37239","body":"## Overview\n\nlibbabl 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}