CVE-2025-9648

A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests. This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.

CVSS

No CVSS.

References

Link	Resource
https://cert.pl/en/posts/2025/09/CVE-2025-9648
https://github.com/civetweb/civetweb
https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133
https://github.com/civetweb/civetweb/issues/1348

Configurations

No configuration.

History

19 Oct 2026, 16:10

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad en la función mg_handle_form_request de la biblioteca CivetWeb permite a atacantes remotos desencadenar una condición de denegación de servicio (DoS). Al enviar una solicitud HTTP POST especialmente diseñada que contiene un byte nulo en la carga útil, el servidor entra en un bucle infinito durante el análisis de datos de formulario. Múltiples solicitudes maliciosas resultarán en un agotamiento completo de la CPU y dejarán el servicio sin respuesta a solicitudes posteriores. Este problema fue corregido en el commit 782e189. Este problema afecta solo a la biblioteca, el ejecutable independiente precompilado por el proveedor no se ve afectado.

Information

Published : 2025-09-29 12:15

Updated : 2026-10-19 16:10

NVD link : CVE-2025-9648

Mitre link : CVE-2025-9648

CVE.ORG link : CVE-2025-9648

JSON object : View

Products Affected

No product.

CWE

CWE-158

Improper Neutralization of Null Byte or NUL Character

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