CVE-2020-37239

critical · 9.3

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.

9.3

CVSS

0.5%

EPSS (exploit prob.)

39th

EPSS percentile

2026-05-16

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-415

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2020-37239