Bug 2496102 (CVE-2026-20217)

Summary: CVE-2026-20217 clamav: ClamAV: Denial of Service via crafted PESpin file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in ClamAV. An unauthenticated, remote attacker can exploit a vulnerability in the PESpin file format parser by submitting a specially crafted file. This flaw, caused by improper boundary checks, leads to an out-of-bounds buffer write and memory corruption. A successful exploit can cause the ClamAV scanning process to terminate, resulting in a Denial of Service (DoS) condition on the affected software.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2496827, 2496828    
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Description OSIDB Bzimport 2026-07-01 18:02:35 UTC 
A vulnerability in the PESpin 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 PESpin 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 PESpin 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.