CVE-2026-55961 — wolfSSL_PKCS7_verify() reports success for degenerate (certs-only) PKCS#7 with no signer

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
wolfSSL / wolfSSL	affected 3.15.7 through 5.9.1

CWE

CWE-347

References

https://github.com/wolfSSL/wolfssl/pull/10702
https://www.wolfssl.com/docs/security-vulnerabilities/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.