CVE-2026-20348

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%CVSS: 7.5Exploit: None knownExposed: 0

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

A vulnerability in the XAR 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 XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 19, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
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-2026-20348(3)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
clamav0.103.10+dfsg-0+deb11u1 ... 1.4.5+dfsg-3 (57 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
clamav1.0.1+dfsg-2 ... 1.4.6+dfsg-1 (37 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
clamav1.4.3+dfsg-1 ... 1.4.6+dfsg-1 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
clamav1.4.3+dfsg-1 ... 1.4.5+dfsg-3 (7 versions)1.4.6+dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 39× in last 7d / 149× 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 208 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20348?
CVE-2026-20348 is a high vulnerability published on August 7, 2026. A vulnerability in the XAR 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 XAR…
When was CVE-2026-20348 disclosed?
CVE-2026-20348 was first published in the National Vulnerability Database on August 7, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20348 actively exploited?
CVE-2026-20348 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 60.7% of all scored CVEs.
What is the CVSS score of CVE-2026-20348?
CVE-2026-20348 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-20348?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20348, 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.

Dependency Blast Radius

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