CVE-2026-5194

Critical

Description

Missing hash/digest size and OID checks allow digests smaller than allowed when verifying ECDSA certificates, or smaller than is appropriate for the relevant key type, to be accepted by signature verification functions. This could lead to reduced security of ECDSA certificate-based authentication if the public CA key used is also known. This affects ECDSA/ECC verification when EdDSA or ML-DSA is also enabled.

SeverityCritical

CVSS9.1

Exploit probability—

ProductWolfssl

PublishedApr 9, 2026

First seenApr 9, 2026

Weakness typeCWE-295CWE-295

How to fix

Update

wolfssl wolfssl5.9.1 or later

Patches

github.com/wolfSSL/wolfssl/pull/10131

Affected products

Product	Affected versions	Fixed in
wolfssl wolfssl	3.12.0 ≤ v < 5.9.1	5.9.1

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