CVE-2026-20339

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-07. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 7, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. Patch available.
generic🟡 PoC Available

ClamAV Vulnerabilities Affecting Cisco Products: August 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26

Vendor Advisories for CVE-2026-20339(3)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibclamav12 (1.5.4+dfsg-0ubuntu0.26.04.1) @ resolute2026-10-04ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
clamav0.103.10+dfsg-0+deb11u1 ... 1.4.5+dfsg-3 (57 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
clamav1.0.1+dfsg-2 ... 1.4.6+dfsg-1 (37 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
clamav1.4.3+dfsg-1 ... 1.4.6+dfsg-1 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
clamav1.4.3+dfsg-1 ... 1.4.5+dfsg-3 (7 versions)
  • every version up to 1.4.6+dfsg-1: fixed in 1.4.6+dfsg-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 24× in last 7d / 130× 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 262 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-20339?
CVE-2026-20339 is a high vulnerability published on August 7, 2026. A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in…
When was CVE-2026-20339 disclosed?
CVE-2026-20339 was first published on August 7, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20339 actively exploited?
CVE-2026-20339 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20339?
CVE-2026-20339 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-20339?
A fix for CVE-2026-20339 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-20339 are linked in the Vendor Advisories panel on this page.

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