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Description

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.

PUBLISHED Reserved 2026-05-15 | Published 2026-05-16 | Updated 2026-05-18 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Double Free

Product status

0.1.62
affected

Credits

Carter Yagemann finder

References

www.exploit-db.com/exploits/49259 (ExploitDB-49259) exploit

www.gegl.org (Official Product Homepage) product

www.gegl.org/babl/ (Product Reference) product

www.vulncheck.com/...ken-double-free-detection-memory-safety (VulnCheck Advisory: libbabl 0.1.62 Broken Double Free Detection Memory Safety) third-party-advisory

cve.org (CVE-2020-37239)

nvd.nist.gov (CVE-2020-37239)

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