What’s Vulnerable › Vulnerabilities

CVE-2020-37239: libbabl 0.1.62 Broken Double Free Detection Memory Safety

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-16 · updated 2026-09-29
• Weakness: CWE-415

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.

Affected products

• Gegl libbabl: 0.1.62

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

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