CVE catalog
CVE-2026-20031
A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vu
- Severity
- Medium · CVSS 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.44% · Oct 25, 2026
A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | clamav | sid | 1.4.6+dfsg-1 | fixed |
| Debian | clamav | forky | 1.4.6+dfsg-1 | fixed |
| Debian | clamav | trixie | 1.4.3+dfsg-1 | vulnerable |
| Debian | clamav | bookworm | 1.4.3+dfsg-1~deb12u2 | vulnerable |
| Debian | clamav | bookworm-security | 1.4.6+dfsg-0+deb12u1 | fixed |
| Cpe | clamav | Not reported | Not reported | vulnerable |
| Suse | clamav | linux enterprise high performance computing 15 sp4-espos | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise high performance computing 15 sp4-ltss | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise high performance computing 15 sp5-espos | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise high performance computing 15 sp5-ltss | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise server 15 sp4-ltss | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise server 15 sp5-ltss | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise server for sap applications 15 sp4 | 1.5.2-150400.13.5.1 | fixed |
| Suse | clamav | linux enterprise server for sap applications 15 sp5 | 1.5.2-150400.13.5.1 | fixed |
| Ubuntu | clamav | pro | 0.101.4+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.1+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.1+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.1+dfsg-2ubuntu2 | vulnerable |
| Ubuntu | clamav | pro | 0.102.2+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.2+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.3+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.4+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.2+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.2+dfsg-0ubuntu0.20.04.2 | vulnerable |
| Ubuntu | clamav | pro | 0.103.5+dfsg-1~20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.6+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.8+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.9+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.11+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.12+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 1.4.3+dfsg-0ubuntu0.20.04.1+esm1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.3+dfsg-1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.4+dfsg-1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.4+dfsg-1build1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.5+dfsg-1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.6+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.8+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.9+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.11+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.12+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 1.4.3+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 1.4.4+dfsg-0ubuntu0.22.04.1 | fixed |
| Ubuntu | clamav | 24.04 | 1.0.2+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.3+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.4+dfsg-0ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.5+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.5+dfsg-1.1ubuntu2 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.5+dfsg-1.1ubuntu3 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.7+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.8+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.4.3+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.4.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav | 25.10 | 1.4.2+dfsg-0ubuntu1 | vulnerable |
| Ubuntu | clamav | 25.10 | 1.4.2+dfsg-0ubuntu2 | vulnerable |
| Ubuntu | clamav | 25.10 | 1.4.2+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | 25.10 | 1.4.3+dfsg-0ubuntu1 | vulnerable |
| Ubuntu | clamav | 25.10 | 1.4.3+dfsg-0ubuntu2 | vulnerable |
| Ubuntu | clamav | 25.10 | 1.4.4+dfsg-0ubuntu0.25.10.1 | fixed |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-0ubuntu2 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-0ubuntu3 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-2ubuntu2 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-2ubuntu3 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.4+dfsg-0ubuntu0.26.04.1 | fixed |
| Opensuse | clamav | leap 16.0 | 1.5.2-160000.1.1 | fixed |
| Suse | clamav | linux enterprise server 12 sp5-ltss | 1.5.2-3.53.1 | fixed |
| Suse | clamav | linux enterprise server ltss extended security 12 sp5 | 1.5.2-3.53.1 | fixed |
| Suse | clamav | linux enterprise module for basesystem 15 sp7 | 1.5.2-150600.18.25.1 | fixed |
| Suse | clamav | linux enterprise server 15 sp6-ltss | 1.5.2-150600.18.25.1 | fixed |
| Suse | clamav | linux enterprise server for sap applications 15 sp6 | 1.5.2-150600.18.25.1 | fixed |
| Opensuse | clamav | leap 15.6 | 1.5.2-150600.18.25.1 | fixed |
| Opensuse | clamav | tumbleweed | 1.5.2-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | clamav | source | sid | 1.4.4+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | clamav | source | forky | 1.4.4+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | clamav | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | clamav | source | bookworm | 1.4.6+dfsg-0+deb12u1 | not yet assigned | Not reported | Not reported |
| Suse | clamav | rpm | linux enterprise high performance computing 15 sp4-espos | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise high performance computing 15 sp4-ltss | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise high performance computing 15 sp5-espos | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise high performance computing 15 sp5-ltss | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise server 15 sp4-ltss | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise server 15 sp5-ltss | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise server for sap applications 15 sp4 | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Suse | clamav | rpm | linux enterprise server for sap applications 15 sp5 | 1.5.2-150400.13.5.1 | Not reported | SUSE-SU-2026:0906-2 | Not reported |
| Ubuntu | clamav | deb | 22.04 | 1.4.4+dfsg-0ubuntu0.22.04.1 | Not reported | UBUNTU-CVE-2026-20031 | Not reported |
| Ubuntu | clamav | deb | 24.04 | 1.4.4+dfsg-0ubuntu0.24.04.1 | Not reported | UBUNTU-CVE-2026-20031 | Not reported |
| Ubuntu | clamav | deb | 25.10 | 1.4.4+dfsg-0ubuntu0.25.10.1 | Not reported | UBUNTU-CVE-2026-20031 | Not reported |
| Ubuntu | clamav | deb | 26.04 | 1.4.4+dfsg-0ubuntu0.26.04.1 | Not reported | UBUNTU-CVE-2026-20031 | Not reported |
| Opensuse | clamav | rpm | leap 16.0 | 1.5.2-160000.1.1 | Not reported | OPENSUSE-SU-2026:20479-1 | Not reported |
| Suse | clamav | rpm | linux enterprise server 12 sp5-ltss | 1.5.2-3.53.1 | Not reported | SUSE-SU-2026:1324-1 | Not reported |
| Suse | clamav | rpm | linux enterprise server ltss extended security 12 sp5 | 1.5.2-3.53.1 | Not reported | SUSE-SU-2026:1324-1 | Not reported |
| Suse | clamav | rpm | linux enterprise module for basesystem 15 sp7 | 1.5.2-150600.18.25.1 | Not reported | SUSE-SU-2026:1325-1 | Not reported |
| Suse | clamav | rpm | linux enterprise server 15 sp6-ltss | 1.5.2-150600.18.25.1 | Not reported | SUSE-SU-2026:1325-1 | Not reported |
| Suse | clamav | rpm | linux enterprise server for sap applications 15 sp6 | 1.5.2-150600.18.25.1 | Not reported | SUSE-SU-2026:1325-1 | Not reported |
| Opensuse | clamav | rpm | leap 15.6 | 1.5.2-150600.18.25.1 | Not reported | SUSE-SU-2026:1325-1 | Not reported |
| Opensuse | clamav | rpm | tumbleweed | 1.5.2-1.1 | Not reported | OPENSUSE-SU-2026:10325-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [clamav]Affected
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-base]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-daemon]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-doc]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-docs]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-freshclam]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-milter]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-testfiles]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamdscan]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [libclamav12]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [libclamav-dev]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
[Debian 13 (Trixie)]
- [clamav]Affected
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-base]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamav-daemon]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-doc]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamav-docs]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamav-freshclam]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-milter]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-testfiles]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamdscan]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10325-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-20031]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-20031]
- [https://osv.dev/vulnerability/SUSE-SU-2026:0906-2]
- [https://osv.dev/vulnerability/SUSE-SU-2026:1324-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:1325-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-20031]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10325-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20479-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-20031]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20031.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0593.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]