PatchTheCEVCVE-2026-20348: A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cau
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HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE
CVE-2026-20348 is a high-severity flaw (CVSS 7.5) affecting secure endpoint, secure endpoint, secure endpoint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR content to be scanned by ClamAV on
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 51%) |
| CISA exploited list | No |
| Weakness | CWE-120 |
| Published | 2026-08-07 |
| Last modified | 2026-10-23 |
Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
cisco secure endpoint UPGRADE
Affected: < 1.27.4
Fixed in: 1.27.4
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy secure-endpoint || rpm -q secure-endpoint || secure-endpoint --version
2. UPGRADE to 1.27.4 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
cisco secure endpoint UPGRADE
Affected: < 1.29.2
Fixed in: 1.29.2
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy secure-endpoint || rpm -q secure-endpoint || secure-endpoint --version
2. UPGRADE to 1.29.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
cisco secure endpoint UPGRADE
Affected: < 7.5.24.21780 · >= 8.0.0 and < 8.6.3
Fixed in: 7.5.24.21780, 8.6.3
Safe to downgrade to: a release before 8.0.0
1. Check installed version
apt-cache policy secure-endpoint || rpm -q secure-endpoint || secure-endpoint --version
2. UPGRADE to 7.5.24.21780 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)
apt-cache madison secure-endpoint
sudo apt install secure-endpoint=<VERSION_BEFORE_8.0.0>
sudo apt-mark hold secure-endpoint
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list secure-endpoint
sudo dnf downgrade secure-endpoint-<VERSION_BEFORE_8.0.0>
sudo dnf versionlock add secure-endpoint
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Fedora 46 · clementine · FIXED · 1.4.2-1.fc46 · FEDORA-2026-3e748ef4d3 · source
sudo dnf upgrade --advisory=FEDORA-2026-3e748ef4d3
Ubuntu 22.04 · clamav · FIXED · 1.5.4+dfsg-0ubuntu0.22.04.1
sudo apt update && sudo apt install --only-upgrade clamav
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' clamav)" ge "1.5.4+dfsg-0ubuntu0.22.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · clamav · FIXED · 1.5.4+dfsg-0ubuntu0.24.04.1
sudo apt update && sudo apt install --only-upgrade clamav
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' clamav)" ge "1.5.4+dfsg-0ubuntu0.24.04.1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · clamav · FIXED · 1.4.6+dfsg-0+deb12u1
sudo apt update && sudo apt install --only-upgrade clamav
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' clamav)" ge "1.4.6+dfsg-0+deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · clamav · NO FIX YET
Alpine 3.24 · clamav · FIXED · clamav-1.4.6-r0
apk add --upgrade clamav
apk info -v clamav
sudo dnf update --advisory=ALAS2023-2026-2116
sudo yum update --advisory=ALAS2-2026-3894
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-Wuuv
Advisories and coverage
Official advisories
- Amazon Linux 2 ALAS: ALAS2-2026-3894 (important): clamav1.4 2026-08-31
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.