Improper Verification of Cryptographic Signature in wolfSSL - CVE-2026-55961
Published: July 1, 2026
Vulnerability identifier: #VU136632
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55961
CWE-ID: CWE-347
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 signature verification.
The vulnerability exists due to improper authentication in wolfSSL_PKCS7_verify() when processing a degenerate PKCS#7 object with empty signerInfos. A remote attacker can supply a crafted certs-only PKCS#7 object to bypass signature verification.
Only OpenSSL compatibility builds that call the PKCS7_verify() compatibility API on potentially degenerate PKCS#7 bundles are affected.
How to mitigate CVE-2026-55961
Install security update from vendor's website.