CVE-2025-11936

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

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://github.com/wolfSSL/wolfssl	Product
https://github.com/wolfSSL/wolfssl/pull/9117	Issue Tracking Patch
https://github.com/wolfSSL/wolfssl/pull/9117	Issue Tracking Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

History

19 Oct 2026, 13:10

Type	Values Removed	Values Added
Summary		(es) Validación de entrada incorrecta en el análisis de KeyShareEntry de TLS 1.3 en wolfSSL v5.8.2 en múltiples plataformas permite a un atacante remoto no autenticado causar una denegación de servicio mediante el envío de un mensaje ClientHello manipulado que contiene valores KeyShareEntry duplicados para el mismo grupo compatible, lo que lleva a un consumo excesivo de CPU y memoria durante el procesamiento de ClientHello.

Information

Published : 2025-11-21 23:15

Updated : 2026-10-19 13:10

NVD link : CVE-2025-11936

Mitre link : CVE-2025-11936

CVE.ORG link : CVE-2025-11936

JSON object : View

Products Affected

wolfssl

wolfssl

CWE

CWE-20

Improper Input Validation

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