High [CVE-2026-20216] Denial of Service via crafted InstallShield file
This high-severity Red Hat Linux advisory covers CVE-2026-20216.
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Summary
A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources during file scanning.
A successful exploit could allow the attacker to terminate the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software. An unauthenticated, remote attacker could exploit this vulnerability by submitting a specially crafted InstallShield file for scanning.
ClamAV, when deployed in Red Hat environments, is often used for scanning untrusted files. Successful exploitation can lead to the ClamAV scanning process terminating and consuming system resources, impacting the availability of the scanning service.
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-770.
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
- To reduce the risk of denial of service, deploy ClamAV within a sandboxed environment to contain potential resource exhaustion. Additionally, exercise caution when processing untrusted InstallShield files, and restrict their sources to trusted origins where possible.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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