Search/CVE-2026-20243
● CVE — High

CVE-2026-20243

Vendorclamav, ciscoProductclamav, secure endpointDiscoveredJul 1, 2026UpdatedOct 25, 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 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 v3.1
7.5 HIGH
EPSS
0.57%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
1
sources referencing this CVE
Related IOCs
0
seen in the same coverage
Intelligence Reports1
1 intelligence report available

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EPSS Trend
Aug 16, 2026 → Aug 26, 2026
▲ 0.07pp
0.50% → 0.57% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityNONE
AvailabilityHIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Connections
4 relationships
Timeline
disclosure → media coverage
Jul 1, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 25, 2026
Jul 8, 2026
ubuntu.com reports: USN-8517-1: ClamAV vulnerabilities