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 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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ

Configurations

No configuration.

History

17 Jun 2026, 10:16

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad en el módulo HTML Cascading Style Sheets (CSS) de ClamAV podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad se debe a un manejo de errores inadecuado al dividir cadenas UTF-8. Un atacante podría explotar esta vulnerabilidad al enviar un archivo HTML manipulado para ser escaneado por ClamAV en un dispositivo afectado. Un exploit exitoso podría permitir al atacante terminar el proceso de escaneo.

04 Mar 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-04 18:16

Updated : 2026-06-17 10:16

NVD link : CVE-2026-20031

Mitre link : CVE-2026-20031

CVE.ORG link : CVE-2026-20031

JSON object : View

Products Affected

No product.

CWE

CWE-248

Uncaught Exception

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"2.7.0"}, {"status": "affected", "version": "2.8.0"}, {"status": "affected", "version": "2.9.0"}, {"status": "affected", "version": "2.10.0"}, {"status": "affected", "version": "2.10.1"}, {"status": "affected", "version": "2.11.0"}, {"status": "affected", "version": "1.14.1"}, {"status": "affected", "version": "1.15.1"}, {"status": "affected", "version": "1.15.2"}, {"status": "affected", "version": "1.15.3"}, {"status": "affected", "version": "1.15.4"}, {"status": "affected", "version": "1.15.5"}, {"status": "affected", "version": "1.15.6"}, {"status": "affected", "version": "1.16.0"}, {"status": "affected", "version": "1.16.1"}, {"status": "affected", "version": "1.16.2"}, {"status": "affected", "version": "1.16.3"}, {"status": "affected", "version": "1.18.0"}, {"status": "affected", "version": "1.18.1"}, {"status": "affected", "version": "1.20.0"}, {"status": "affected", "version": "1.21.0"}, {"status": "affected", "version": "1.21.1"}, {"status": "affected", "version": "1.21.2"}, {"status": "affected", "version": "1.21.3"}, {"status": "affected", "version": "1.22.0"}, {"status": "affected", "version": "1.22.1"}, {"status": "affected", "version": "1.22.2"}, {"status": "affected", "version": "1.22.3"}, {"status": "affected", "version": "1.22.4"}, {"status": "affected", "version": "1.24.0"}, {"status": "affected", "version": "1.24.1"}, {"status": "affected", "version": "1.24.2"}, {"status": "affected", "version": "1.24.3"}, {"status": "affected", "version": "1.24.4"}, {"status": "affected", "version": "1.26.0"}, {"status": "affected", "version": "1.24.5"}, {"status": "affected", "version": "1.26.1"}, {"status": "affected", "version": "1.27.0"}, {"status": "affected", "version": "1.15.0"}, {"status": "affected", "version": "1.17.0"}, {"status": "affected", "version": "1.17.1"}, {"status": "affected", "version": "1.17.2"}, {"status": "affected", "version": "1.19.0"}, {"status": "affected", "version": "1.20.1"}, {"status": "affected", "version": "1.20.2"}, {"status": "affected", "version": "1.20.3"}, {"status": "affected", "version": "1.20.4"}, {"status": "affected", "version": "1.20.5"}, {"status": "affected", "version": "1.20.6"}, {"status": "affected", "version": "1.23.0"}, {"status": "affected", "version": "1.23.1"}, {"status": "affected", "version": "1.20.7"}, {"status": "affected", "version": "1.20.8"}, {"status": "affected", "version": "1.25.0"}, {"status": "affected", "version": "1.25.1"}, {"status": "affected", "version": "1.25.2"}, {"status": "affected", "version": "1.27.1"}, {"status": "affected", "version": "1.27.2"}, {"status": "affected", "version": "7.3.13"}, {"status": "affected", "version": "7.3.15"}, {"status": "affected", "version": "7.4.1"}, {"status": "affected", "version": "7.4.1.20425"}, {"status": "affected", "version": "7.4.1.20439"}, {"status": "affected", "version": "7.4.3"}, {"status": "affected", "version": "7.4.3.20679"}, {"status": "affected", "version": "7.4.5"}, {"status": "affected", "version": "7.5.1.20813"}, {"status": "affected", "version": "7.5.1.20833"}, {"status": "affected", "version": "7.5.3"}, {"status": "affected", "version": "7.5.5"}, {"status": "affected", "version": "8.0.1.21160"}, {"status": "affected", "version": "8.0.1.21164"}, {"status": "affected", "version": "7.5.7"}, {"status": "affected", "version": "7.5.9"}, {"status": "affected", "version": "7.5.11"}, {"status": "affected", "version": "8.1.7.21585"}, {"status": "affected", "version": "7.5.13.21586"}, {"status": "affected", "version": "7.5.13.21598"}, {"status": "affected", "version": "8.2.1.21612"}, {"status": "affected", "version": "8.2.1.21650"}, {"status": "affected", "version": "7.5.15.21611"}, {"status": "affected", "version": "7.5.17.21680"}, {"status": "affected", "version": "8.2.3.30119"}, {"status": "affected", "version": "8.2.4.30130"}, {"status": "affected", "version": "8.4.0"}, {"status": "affected", "version": "7.5.19"}, {"status": "affected", "version": "8.4.1.30298"}, {"status": "affected", "version": "8.4.2.30317"}, {"status": "affected", "version": "8.4.1.30307"}, {"status": "affected", "version": "7.5.20"}, {"status": "affected", "version": "8.4.3"}, {"status": "affected", "version": "8.4.4.30419"}, {"status": "affected", "version": "8.4.4.30467"}, {"status": "affected", "version": "7.5.21.21732"}, {"status": "affected", "version": "8.4.5.30483"}], "defaultStatus": "unknown"}]}], "published": "2026-03-04T18:16:16.773", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-248"}]}], "descriptions": [{"lang": "en", "value": "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.\r\n\r\nThis 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."}, {"lang": "es", "value": "Una vulnerabilidad en el m\u00f3dulo HTML Cascading Style Sheets (CSS) de ClamAV podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a un manejo de errores inadecuado al dividir cadenas UTF-8. Un atacante podr\u00eda explotar esta vulnerabilidad al enviar un archivo HTML manipulado para ser escaneado por ClamAV en un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante terminar el proceso de escaneo."}], "lastModified": "2026-06-17T10:16:56.607", "sourceIdentifier": "psirt@cisco.com"}