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Vulnerability details: VCID-5kba-63mx-hya7
Vulnerability ID VCID-5kba-63mx-hya7
Aliases CVE-2026-20031
Summary 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.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-248 Uncaught Exception
System Score Found at
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00134 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00134 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00134 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00134 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00134 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
epss 0.00134 https://api.first.org/data/v1/epss?cve=CVE-2026-20031
cvssv3.1 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 5.3 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ
ssvc Track https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-20031
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20031
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cisco-sa-clamav-css-Fn4QSZ https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-05T15:51:58Z/ Found at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ
Exploit Prediction Scoring System (EPSS)
Percentile 0.31592
EPSS Score 0.00123
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-02T12:44:01.064579+00:00 SUSE Severity Score Importer Import https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml 38.0.0