Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cisco | Cisco Secure Endpoint | 7.0.5, 6.2.19, 7.3.3, 7.2.13, 6.1.5, 6.3.1, 6.2.5, 7.3.5, 6.2.1, 7.2.7, 7.1.1, 6.3.5, 6.2.9, 7.3.1, 6.1.7, 7.2.11, 7.2.3, 7.1.5, 6.3.3, 7.3.9, 6.2.3, 6.1.9, 6.0.9, 7.2.5, 6.0.7, 6.3.7, 1.12.3, 1.8.0, 1.11.1, 1.12.4, 1.10.0, 1.12.0, 1.8.1, 1.10.1, 1.12.1, 1.12.6, 1.14.0, 1.10.2, 1.12.7, 1.12.2, 1.6.… | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | clamav | 1.4.4+dfsg-1 | — |
| Debian 13 | clamav | No fix yet | — |
| Debian 12 | clamav | 1.4.6+dfsg-0+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | clamav | 1.4.4+dfsg-0ubuntu0.26.04.1 | — |
| Ubuntu 25.10 | clamav | 1.4.4+dfsg-0ubuntu0.25.10.1 | — |
| Ubuntu 24.04 LTS | clamav | 1.4.4+dfsg-0ubuntu0.24.04.1 | — |
| Ubuntu 22.04 LTS | clamav | 1.4.4+dfsg-0ubuntu0.22.04.1 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | clamav | No fix yet | — |
| Ubuntu Pro 18.04 LTS | clamav | No fix yet | — |
| Ubuntu Pro 16.04 LTS | clamav | No fix yet | — |
| Ubuntu Pro 14.04 LTS | clamav | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | clamav | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 |
| SLES 15 SP6 | clamav | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 |
| SLES 15 SP5 | clamav | 1.5.2-150400.13.5.1 | SUSE-SU-2026:0906-2 |
| SLES 15 SP4 | clamav | 1.5.2-150400.13.5.1 | SUSE-SU-2026:0906-2 |
| SLES 12 SP5 | clamav | 1.5.2-3.53.1 | SUSE-SU-2026:1324-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | clamav | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 |
| SLES for SAP 15 SP5 | clamav | 1.5.2-150400.13.5.1 | SUSE-SU-2026:0906-2 |
| SLES for SAP 15 SP4 | clamav | 1.5.2-150400.13.5.1 | SUSE-SU-2026:0906-2 |
| SLE HPC 15 SP5 | clamav | 1.5.2-150400.13.5.1 | SUSE-SU-2026:0906-2 |
| SLE HPC 15 SP4 | clamav | 1.5.2-150400.13.5.1 | SUSE-SU-2026:0906-2 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | clamav | 1.5.2-1.1 | openSUSE-SU-2026:10325-1 |
| openSUSE Leap 16.0 | clamav | 1.5.2-160000.1.1 | openSUSE-SU-2026:20479-1 |
| openSUSE Leap 15.6 | clamav | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | clamav | 1.4.4-r0 | — |
| Alpine v3.23 | clamav | 1.4.4-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | clamd1.4 +8 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 |
| Amazon Linux 2023 | clamd1.5 +8 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 |
| Amazon Linux 2 | clamd1.4 +8 | 1.4.4-1.amzn2.0.1 | ALAS2-2026-3276 |
Advisories 10
- WID-SEC-2026-0593 ClamAV: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 22, 2026
- SUSE-SU-2026:0906-2 Security update for clamav SUSE / openSUSE Security Updates · Jun 27, 2026
- ALAS2023-2026-1630 Moderate: clamav1.4 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 30, 2026
- ALAS2023-2026-1631 Moderate: clamav1.5 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 30, 2026
- ALAS2-2026-3276 Moderate: clamav1.4 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 29, 2026
- openSUSE-SU-2026:20479-1 Security update for clamav SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:1324-1 Security update for clamav SUSE / openSUSE Security Updates · Apr 15, 2026
- SUSE-SU-2026:1325-1 Security update for clamav SUSE / openSUSE Security Updates · Apr 15, 2026
- openSUSE-SU-2026:10325-1 clamav-1.5.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 14, 2026
- NCSC-2026-0077 Kwetsbaarheden verholpen in Cisco Secure Firewall systemen NCSC-NL (Netherlands) · Mar 5, 2026