Improper Certificate Validation in wolfSSL - CVE-2026-89102
Published: October 5, 2026
Vulnerability identifier: #VU153282
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89102
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to forge certificates for arbitrary identities.
The vulnerability exists due to improper certificate validation in RFC 6961 multiple OCSP response stapling when processing a peer certificate chain. A remote attacker can present a certificate chain containing an unauthorized certificate authority to forge certificates for arbitrary identities.
Exploitation requires a certificate and private key that chain to a CA trusted by the client, and the affected client configuration uses OCSP multi stapling.
Affected software
wolfSSL
How to mitigate CVE-2026-89102
Install security update from vendor's website.
wolfSSL - update to 5.9.4