Improper Certificate Validation in wolfSSL - CVE-2026-5263
Published: April 14, 2026
Vulnerability identifier: #VU125925
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5263
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 name constraints validation.
The vulnerability exists due to improper certificate validation in wolfcrypt/src/asn.c when verifying certificate chains containing URI SAN entries. A remote attacker can supply a crafted certificate chain to bypass certificate name constraints validation.
Exploitation requires a compromised or malicious subordinate CA.
How to mitigate CVE-2026-5263
Install security update from vendor's website.