CVE-2025-11934

Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.

CVSS v3 2.7 LOW

2.7^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/wolfSSL/wolfssl	Product
https://github.com/wolfSSL/wolfssl/pull/9113	Issue Tracking Patch
https://github.com/wolfSSL/wolfssl/pull/9113	Issue Tracking Patch

Configurations

Configuration 1 (hide)

AND

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

OR	cpe:2.3:o:apple:macos:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*

History

19 Oct 2026, 13:10

Type	Values Removed	Values Added
Summary		(es) La validación de entrada incorrecta en la negociación del algoritmo de firma CertificateVerify de TLS 1.3 en wolfSSL 5.8.2 y versiones anteriores en múltiples plataformas permite la degradación del algoritmo de firma utilizado. Por ejemplo, cuando un cliente envía ECDSA P521 como el algoritmo de firma compatible, el servidor anteriormente podía responder con ECDSA P256 como el algoritmo de firma aceptado y la conexión continuaría usando ECDSA P256, si el cliente soporta ECDSA P256.

Information

Published : 2025-11-21 23:15

Updated : 2026-10-19 13:10

NVD link : CVE-2025-11934

Mitre link : CVE-2025-11934

CVE.ORG link : CVE-2025-11934

JSON object : View

Products Affected

linux

linux_kernel

apple

macos

wolfssl

wolfssl

CWE

CWE-20

Improper Input Validation

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For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256."}, {"lang": "es", "value": "La validaci\u00f3n de entrada incorrecta en la negociaci\u00f3n del algoritmo de firma CertificateVerify de TLS 1.3 en wolfSSL 5.8.2 y versiones anteriores en m\u00faltiples plataformas permite la degradaci\u00f3n del algoritmo de firma utilizado. Por ejemplo, cuando un cliente env\u00eda ECDSA P521 como el algoritmo de firma compatible, el servidor anteriormente pod\u00eda responder con ECDSA P256 como el algoritmo de firma aceptado y la conexi\u00f3n continuar\u00eda usando ECDSA P256, si el cliente soporta ECDSA P256."}], "lastModified": "2026-10-19T13:10:00.110", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EB81B784-14DD-4CD0-859A-62D42ADDD7D3", "versionEndExcluding": "5.8.4", "versionStartIncluding": "5.8.2"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "facts@wolfssl.com"}