CVE-2026-20031
clamav: improper error handling in the HTML CSS module when splitting UTF-8 strings can lead to denial of
CVE-2026-20031 is fixed in 51 products on 1 platform, first by clamav 1.4.4+dfsg-0ubuntu0.22.04.1, released March 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.3
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0047
41st percentile
improper error handling in the HTML CSS module when splitting UTF-8 strings can lead to denial of
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| clamav · Debian 12.15 (bookworm) | 1.4.6+dfsg-0+deb12u1 | DEBIAN-CVE-2026-20031 | Mar 4, 2026 |
| clamav · Debian 14 | 1.4.4+dfsg-1 | DEBIAN-CVE-2026-20031 | Mar 4, 2026 |
| clamav · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav · opensuse-leap 15.6 | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 | Apr 14, 2026 |
| clamav · opensuse-leap 16.0 | 1.5.2-160000.1.1 | OPENSUSE-SU-2026:20479-1 | Apr 20, 2026 |
| clamav · sles 15.6 | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 | Apr 14, 2026 |
| clamav · sles 15.7 | 1.5.2-150600.18.25.1 | SUSE-SU-2026:1325-1 | Apr 14, 2026 |
| clamav-base · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav-base 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav-base · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav-base 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav-base · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav-base 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav-base · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav-base 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav-daemon · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav-daemon 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav-daemon · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav-daemon 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav-daemon · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav-daemon 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav-daemon · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav-daemon 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav-data · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-debuginfo · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-debugsource · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-devel · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-doc · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-docs · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav-docs 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav-docs · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav-docs 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav-docs · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav-docs 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav-docs · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav-docs 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav-filesystem · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-freshclam · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-freshclam · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav-freshclam 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav-freshclam · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav-freshclam 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav-freshclam · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav-freshclam 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav-freshclam · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav-freshclam 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav-freshclam-debuginfo · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-lib · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-lib-debuginfo · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-milter · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-milter · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav-milter 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav-milter · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav-milter 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav-milter · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav-milter 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav-milter · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav-milter 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav-milter-debuginfo · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamav-testfiles · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamav-testfiles 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamav-testfiles · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamav-testfiles 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamav-testfiles · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamav-testfiles 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamav-testfiles · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamav-testfiles 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| clamav1.4 · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-data · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-debuginfo · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-debugsource · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-devel · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-doc · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-filesystem · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-freshclam · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-freshclam-debuginfo · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-lib · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-lib-debuginfo · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-milter · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.4-milter-debuginfo · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamav1.5 · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-data · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-debuginfo · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-debugsource · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-devel · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-doc · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-filesystem · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-freshclam · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-freshclam-debuginfo · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-lib · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-lib-debuginfo · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-milter · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamav1.5-milter-debuginfo · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamd · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamd-debuginfo · Fedora 43 | 1.4.6-1.fc43 | FEDORA-2026-A9BEEC8485 | Aug 10, 2026 |
| clamd1.4 · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamd1.4-debuginfo · amzn 2023 | 1.4.4-1.amzn2023.0.1 | ALAS2023-2026-1630 | Apr 27, 2026 |
| clamd1.5 · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamd1.5-debuginfo · amzn 2023 | 1.5.2-1.amzn2023.0.1 | ALAS2023-2026-1631 | Apr 27, 2026 |
| clamdscan · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | clamdscan 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| clamdscan · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | clamdscan 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| clamdscan · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | clamdscan 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| clamdscan · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | clamdscan 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
| libclamav12 · Ubuntu 22.04.1 LTS (jammy) | 1.4.4+dfsg-0ubuntu0.22.04.1 | libclamav12 1.4.4+dfsg-0ubuntu0.22.04.1 | Mar 4, 2026 |
| libclamav12 · Ubuntu 24.04.5 LTS (noble) | 1.4.4+dfsg-0ubuntu0.24.04.1 | libclamav12 1.4.4+dfsg-0ubuntu0.24.04.1 | Mar 4, 2026 |
| libclamav12 · Ubuntu 25.10 (questing) | 1.4.4+dfsg-0ubuntu0.25.10.1 | libclamav12 1.4.4+dfsg-0ubuntu0.25.10.1 | Mar 4, 2026 |
| libclamav12 · Ubuntu 26.04.1 LTS (resolute) | 1.4.4+dfsg-0ubuntu0.26.04.1 | libclamav12 1.4.4+dfsg-0ubuntu0.26.04.1 | Mar 4, 2026 |
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