CVE-2020-37239

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.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2020-37239 on 2026-07-07. Shown when MITRE's text differs from the cvelistV5 mirror.

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.

Overview

State

—

Assigner (CNA)

—

CVSS severity

critical

CVSS score

9.8 / 10

CVSS vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Effective score

9.8 / 10 CRITICAL source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2020-37239

Linked Threat

CVE-2020-37239 — CVE-2020-37239

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-05-16 16:16:20 UTC

NVD last modified

2026-05-18 20:16:36 UTC

NVD CVSS v3.1

9.8 / 10 CRITICAL source: disclosure@vulncheck.com

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability subscore

3.9 / 10

Impact subscore

5.9 / 10

EPSS score

0.0011 (probability of exploitation in next 30 days)

EPSS percentile

29.30% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-415 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2020-31239

Assigner

VulnCheck

Published

May 16, 2026, 3:25:55 PM

Updated

May 18, 2026, 6:09:18 PM

EUVD base score (CVSS 4.0)

9.3 / 10
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

EUVD-reported EPSS

0.1100

Vendors

Gegl

Products

libbabl (0.1.62)

Aliases

GHSA-4fvf-cvgm-9hvc

ENISA 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.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (7)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://nvd.nist.gov/vuln/detail/CVE-2020-37239 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2020-37239 tenable:www.cve.org
• https://www.exploit-db.com/exploits/49259 tenable:www.exploit-db.com
• https://www.first.org/epss/ tenable:www.first.org
• https://www.gegl.org tenable:www.gegl.org
• https://www.gegl.org/babl/ tenable:www.gegl.org
• https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety tenable:www.vulncheck.com

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

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