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Fencer Vulns
high 7.5

CVE-2026-20244 json

ClamAV DMG File Processing Denial of Service Vulnerability

published 2026-07-01 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-41084

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 DMG 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 DMG files during scanning, which may result in an integer overflow on 32-bit platforms only. An attacker could exploit this vulnerability by submitting a crafted file that contains DMG 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.

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-2026-20244

  • 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-2026-20244

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-2026-20244

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

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-2026-20244 updated cvss 7.5

clamav: ClamAV: Denial of Service via crafted DMG 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-120 Buffer Copy without Checking Size of Input

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.