High [CVE-2026-20213] Denial of Service via crafted Portable Executable (PE) files
This high-severity Red Hat Linux advisory covers CVE-2026-20213.
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Summary
A vulnerability in the PE 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 PE 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 PE 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. A flaw was found in ClamAV.
An unauthenticated, remote attacker could exploit this vulnerability by submitting a specially crafted file containing Portable Executable (PE) content for scanning. This is an Important flaw in ClamAV's PE file parser, allowing an unauthenticated, remote attacker to trigger a Denial of Service by submitting a crafted PE file for scanning.
The vulnerability stems from improper boundary checks, leading to memory corruption and termination of the scanning process. This could impact systems where ClamAV is deployed to scan untrusted Portable Executable content.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-787.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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