Improper Certificate Validation in wolfSSL - CVE-2026-11999
Published: July 1, 2026
Vulnerability identifier: #VU136628
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-11999
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL
wolfSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass certificate chain validation.
The vulnerability exists due to improper certificate validation in wolfSSL_X509_verify_cert() when processing caller-supplied untrusted intermediates in a chain deeper than the maximum path depth. A remote attacker can present a deeply nested crafted certificate chain to bypass certificate chain validation.
Only builds with OPENSSL_EXTRA enabled are affected. Native wolfSSL TLS/DTLS usage is not impacted, and exploitation requires applications to use the OpenSSL compatibility X509_verify_cert() API with caller-supplied untrusted intermediates.
How to mitigate CVE-2026-11999
Install security update from vendor's website.