CVE-2026-20337ClamAV ZIP File Format Processing Memory Corruption Vulnerability
- 7.5HighCVSS base score
- 0.60%Exploitation in 30 daysEPSS · top 51% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper boundary checks for content in zip files during scanning, which may result in an out-of-bounds write condition. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
Timeline
ID reserved
By cisco
- 10 months later
· 10 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.60% · top 51% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 7.0.5
- affected 6.2.19
- affected 7.3.3
- affected 7.2.13
- affected 6.1.5
- affected 6.3.1
- affected 6.2.5
- affected 7.3.5
- affected 6.2.1
- affected 7.2.7
- affected 7.1.1
- affected 6.3.5
- affected 6.2.9
- affected 7.3.1
- affected 6.1.7
- affected 7.2.11
- affected 7.2.3
- affected 7.1.5
- affected 6.3.3
- affected 7.3.9
- affected 6.2.3
- affected 6.1.9
- affected 6.0.9
- affected 7.2.5
- affected 6.0.7
- affected 6.3.7
- affected 1.12.3
- affected 1.8.0
- affected 1.11.1
- affected 1.12.4
- affected 1.10.0
- affected 1.12.0
- affected 1.8.1
- affected 1.10.1
- affected 1.12.1
- affected 1.12.6
- affected 1.14.0
- affected 1.10.2
- affected 1.12.7
- affected 1.12.2
- and 106 more
What to do
Exploitation: The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in CVE-2026-20337 and CVE-2026-20338. The Cisco PSIRT is not aware of proof-of-concept exploit code for any of the other vulnerabilities that are described in this advisory. The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-54528 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-20337)Record last updated .