CVE-2026-20243

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. 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: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

A vulnerability in the ALZ file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in ALZ files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains ALZ 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
38(Track)
EG Risk 38/100SSVC: 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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 9, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
No patch confirmed yet.
generic

ClamAV Vulnerabilities Affecting Cisco Products: July 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR

Vendor Advisories for CVE-2026-20243(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 / EcosystemFixed in / PatchReleasedSource
ubuntulibclamav12 (1.5.3+dfsg-0ubuntu0.26.04.1) @ resolute2026-09-06ubuntu

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 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, 1.4.3+dfsg-2, 1.4.4+dfsg-1, 1.4.4+dfsg-21.4.5+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 12× in last 7d / 106× 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 300 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20243?
CVE-2026-20243 is a high vulnerability published on July 1, 2026. A vulnerability in the ALZ file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in ALZ…
When was CVE-2026-20243 disclosed?
CVE-2026-20243 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20243 actively exploited?
CVE-2026-20243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.5% of all scored CVEs.
What is the CVSS score of CVE-2026-20243?
CVE-2026-20243 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-20243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20243, 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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