CVE-2026-55961
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk3th percentile — higher than 3% of all known CVEs
Summary
Vulnerability in wolfSSL library affects PKCS7_verify() function, which incorrectly returned success for degenerate PKCS#7 objects containing only certificates, without a signer. Such an object has empty signerInfos, so the underlying signed-data verification succeeds without authenticating any content.
Risk Assessment
An organization may accept falsely verified PKCS#7 data that contains no actual signature, leading to risk of integrity and authenticity compromise.
Recommendation
Immediately update wolfSSL to a version where the PKCS7_verify() function in the OpenSSL compatibility path rejects objects without a verified signature, regardless of the PKCS7_NOVERIFY flag.
Original NVD description (English source)
wolfSSL_PKCS7_verify() returning success for a degenerate (certs-only) PKCS#7 object that contains no signer. Such an object has empty signerInfos, so the underlying signed-data verification succeeds without authenticating any content. The compatibility-layer verify path now rejects the object when no signer signature has actually been verified, so a PKCS#7 carrying no valid signature is no longer reported as verified. This is enforced regardless of the PKCS7_NOVERIFY flag, which only suppresses signer certificate chain validation and was never intended to waive the requirement that a signature exist. Only affects OpenSSL compatibility builds that call the PKCS7_verify() compatibility API on potentially degenerate PKCS#7 bundles.