Is CVE-2026-55961 actively exploited?

No active exploitation of CVE-2026-55961 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55961 be exploited remotely?

Yes. CVE-2026-55961 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55961?

CVE-2026-55961 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-55961

HIGH

CVE-2026-55961

CWE-347Published: June 25, 2026· Updated: Jun 26, 2026

7.5

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:0.9th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-55961 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.