CVE-2020-37239

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-16. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

May 16, 2026

Last Modified

May 18, 2026

Advisory Details (4)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

libbabl 0.1.62 Broken Double Free Detection Memory Safety | Advisories | VulnCheck

https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety
generic

babl

https://www.gegl.org/babl/
generic

GEGL

https://www.gegl.org
generic🟡 PoC Available

libbabl 0.1.62 - Broken Double Free Detection (PoC) - Linux local Exploit

https://www.exploit-db.com/exploits/49259

Vendor Advisories for CVE-2020-37239(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 91× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 376 total refreshes for this CVE.

  1. 2026-09-04 13:57 UTCEPSS rescore
  2. 2026-09-04 05:03 UTCEPSS rescore
  3. 2026-09-02 14:08 UTCEPSS rescore
  4. 2026-09-01 03:32 UTCEPSS rescore
  5. 2026-08-30 19:14 UTCEPSS rescore
  6. 2026-08-30 01:18 UTCEPSS rescore
  7. 2026-08-27 14:21 UTCEPSS rescore
  8. 2026-08-26 14:42 UTCEPSS rescore
  9. 2026-08-25 13:45 UTCEPSS rescore
  10. 2026-08-24 00:51 UTCGHSA enrichment
  11. 2026-08-23 21:11 UTCGHSA enrichment
  12. 2026-08-23 17:24 UTCEG score recompute
  13. 2026-08-23 17:24 UTCGHSA enrichment
  14. 2026-08-22 00:54 UTCEG score recompute
  15. 2026-08-22 00:54 UTCGHSA enrichment
  16. 2026-08-21 23:45 UTCEPSS rescore
  17. 2026-08-20 22:52 UTCEPSS rescore
  18. 2026-08-20 19:14 UTCEG score recompute
  19. 2026-08-20 19:14 UTCGHSA enrichment
  20. 2026-08-19 17:00 UTCEPSS rescore
  21. 2026-08-18 13:44 UTCEPSS rescore
  22. 2026-08-17 13:51 UTCEG score recompute
  23. 2026-08-17 13:51 UTCGHSA enrichment
  24. 2026-08-17 13:43 UTCEPSS rescore
  25. 2026-08-17 10:11 UTCEG score recompute
Show 75 more
  1. 2026-08-17 10:11 UTCGHSA enrichment
  2. 2026-08-16 14:52 UTCEPSS rescore
  3. 2026-08-16 11:03 UTCGHSA enrichment
  4. 2026-08-16 07:23 UTCGHSA enrichment
  5. 2026-08-16 03:43 UTCEG score recompute
  6. 2026-08-16 03:43 UTCGHSA enrichment
  7. 2026-08-16 02:11 UTCEPSS rescore
  8. 2026-08-15 01:26 UTCEPSS rescore
  9. 2026-08-15 00:18 UTCGHSA enrichment
  10. 2026-08-14 20:38 UTCGHSA enrichment
  11. 2026-08-14 16:58 UTCGHSA enrichment
  12. 2026-08-14 13:16 UTCGHSA enrichment
  13. 2026-08-14 09:36 UTCGHSA enrichment
  14. 2026-08-14 05:56 UTCGHSA enrichment
  15. 2026-08-14 02:16 UTCEG score recompute
  16. 2026-08-14 02:16 UTCGHSA enrichment
  17. 2026-08-13 21:57 UTCEPSS rescore
  18. 2026-08-13 09:35 UTCGHSA enrichment
  19. 2026-08-13 05:55 UTCGHSA enrichment
  20. 2026-08-13 01:46 UTCGHSA enrichment
  21. 2026-08-12 22:06 UTCGHSA enrichment
  22. 2026-08-12 18:26 UTCGHSA enrichment
  23. 2026-08-12 14:43 UTCEG score recompute
  24. 2026-08-12 14:43 UTCGHSA enrichment
  25. 2026-08-12 13:47 UTCEPSS rescore
  26. 2026-08-12 02:09 UTCGHSA enrichment
  27. 2026-08-11 22:28 UTCGHSA enrichment
  28. 2026-08-11 18:49 UTCGHSA enrichment
  29. 2026-08-11 13:59 UTCEG score recompute
  30. 2026-08-11 13:59 UTCGHSA enrichment
  31. 2026-08-11 08:07 UTCGHSA enrichment
  32. 2026-08-11 04:25 UTCGHSA enrichment
  33. 2026-08-11 00:46 UTCEG score recompute
  34. 2026-08-11 00:45 UTCGHSA enrichment
  35. 2026-08-10 11:21 UTCGHSA enrichment
  36. 2026-08-10 07:03 UTCGHSA enrichment
  37. 2026-08-10 03:22 UTCGHSA enrichment
  38. 2026-08-09 23:42 UTCGHSA enrichment
  39. 2026-08-09 20:02 UTCGHSA enrichment
  40. 2026-08-09 16:22 UTCEG score recompute
  41. 2026-08-09 16:22 UTCGHSA enrichment
  42. 2026-08-09 13:43 UTCEPSS rescore
  43. 2026-08-09 12:43 UTCGHSA enrichment
  44. 2026-08-09 09:03 UTCGHSA enrichment
  45. 2026-08-09 05:23 UTCGHSA enrichment
  46. 2026-08-09 01:43 UTCEG score recompute
  47. 2026-08-09 01:43 UTCGHSA enrichment
  48. 2026-08-08 16:33 UTCEPSS rescore
  49. 2026-08-08 12:09 UTCGHSA enrichment
  50. 2026-08-08 08:29 UTCGHSA enrichment
  51. 2026-08-08 04:49 UTCGHSA enrichment
  52. 2026-08-08 01:09 UTCGHSA enrichment
  53. 2026-08-07 21:29 UTCGHSA enrichment
  54. 2026-08-07 17:49 UTCEG score recompute
  55. 2026-08-07 17:49 UTCGHSA enrichment
  56. 2026-08-07 16:23 UTCEPSS rescore
  57. 2026-08-07 14:08 UTCGHSA enrichment
  58. 2026-08-07 10:28 UTCGHSA enrichment
  59. 2026-08-07 06:26 UTCGHSA enrichment
  60. 2026-08-07 01:16 UTCGHSA enrichment
  61. 2026-08-06 20:26 UTCGHSA enrichment
  62. 2026-08-06 16:46 UTCEG score recompute
  63. 2026-08-06 16:46 UTCGHSA enrichment
  64. 2026-08-06 13:43 UTCEPSS rescore
  65. 2026-08-06 12:08 UTCGHSA enrichment
  66. 2026-08-06 08:28 UTCGHSA enrichment
  67. 2026-08-06 04:48 UTCGHSA enrichment
  68. 2026-08-06 01:08 UTCGHSA enrichment
  69. 2026-08-05 21:28 UTCEG score recompute
  70. 2026-08-05 21:28 UTCGHSA enrichment
  71. 2026-08-04 15:06 UTCEPSS rescore
  72. 2026-08-04 10:34 UTCEPSS rescore
  73. 2026-08-04 05:53 UTCGHSA enrichment
  74. 2026-08-04 02:13 UTCGHSA enrichment
  75. 2026-08-03 22:33 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2020-37239?
CVE-2020-37239 is a critical vulnerability published on May 16, 2026. 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…
When was CVE-2020-37239 disclosed?
CVE-2020-37239 was first published in the National Vulnerability Database on May 16, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-37239 actively exploited?
CVE-2020-37239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.8% of all scored CVEs.
What is the CVSS score of CVE-2020-37239?
CVE-2020-37239 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-37239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-37239, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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