CVE-2026-20243

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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 — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 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(high)
EPSS
31.5%
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) @ resolute2026-07-16ubuntu

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.

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 20× in last 7d / 80× 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.

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

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 31.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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