Improper Verification of Cryptographic Signature in wolfSSL - CVE-2026-5194
Published: April 14, 2026
Vulnerability identifier: #VU125923
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-5194
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to reduce the security of certificate-based authentication.
The vulnerability exists due to improper cryptographic signature verification in signature verification functions when verifying certificate signatures. A remote attacker can present certificates with digests smaller than allowed to reduce the security of certificate-based authentication.
The issue affects multiple signature algorithms, including ECDSA/ECC, DSA, ML-DSA, ED25519, and ED448.
Affected software
wolfSSL
How to mitigate CVE-2026-5194
Install security update from vendor's website.
wolfSSL - update to 5.9.1