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Fencer Vulns
high 7.5

CVE-2026-20216 json

ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability

published 2026-07-01 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-41081

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

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. An attacker could exploit this vulnerability by submitting a crafted InstallShield file to be scanned by ClamAV on an affected device. 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.

Patch / fix

  • cisco secure_endpoint 1.27.2, 1.29.0, 8.6.2
  • clamav clamav 1.4.5, 1.5.3
  • clamav Debian 12 1.4.6+dfsg-0+deb12u1
  • clamav Debian 14 1.4.5+dfsg-1

debian advisories DEBIAN-CVE-2026-20216

  • clamav Ubuntu 22.04 LTS 1.5.3+dfsg-0ubuntu0.22.04.2
  • clamav Ubuntu 24.04 LTS 1.5.3+dfsg-0ubuntu0.24.04.1
  • clamav Ubuntu 26.04 LTS 1.5.3+dfsg-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-20216

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav SLE Micro 5.5, SLE High Performance Computing 15 SP5-ESPOS, SLE High Performance Computing 15 SP4-ESPOS +6 more 1.5.3-150400.13.8.1
  • clamav SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 1.5.3-150600.18.28.1
  • clamav SLES for SAP applications 16.0, SLES 16.0 1.5.3-160000.1.1
  • clamav SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.5.3-3.56.1

suse advisories SUSE-SU-2026:2834-2SUSE-SU-2026:2835-1SUSE-SU-2026:2834-1SUSE-SU-2026:2833-1SUSE-SU-2026:22574-1

  • clamav openSUSE Leap 16.0 1.5.3-160000.1.1
  • clamav openSUSE Tumbleweed 1.5.3-1.1

opensuse advisories openSUSE-SU-2026:21252-1openSUSE-SU-2026:11182-1

  • clamav Alpine 3.24 1.4.5-r0

alpine advisories ALPINE-CVE-2026-20216

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav Azure Linux 3.0 1.5.3-1

azure linux advisories AZL-92172

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-20216 updated cvss 7.5

ClamAV: ClamAV: Denial of Service via crafted InstallShield file

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Cisco Cisco Secure Endpoint

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.