Improper Verification of Cryptographic Signature Affecting wolfSSL/wolfssh package, versions [,5.9.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-WOLFSSLWOLFSSH-17660707
- published28 Jun 2026
- disclosed25 Jun 2026
- creditUnknown
Introduced: 25 Jun 2026
CVE-2026-55961 (opens in a new tab)How to fix?
Upgrade wolfSSL/wolfssh to version 5.9.2 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the wolfSSL_PKCS7_verify process. An attacker can bypass content authentication by submitting a degenerate PKCS#7 object with no signer, causing the verification to succeed without validating any signature. This is only exploitable if the OpenSSL compatibility API is used to verify PKCS#7 bundles that may lack valid signatures.