Improper Certificate Validation Affecting wolfssl/wolfssl package, versions [,5.9.1)
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-WOLFSSLWOLFSSL-15990758
- published12 Apr 2026
- disclosed10 Apr 2026
- creditUnknown
Introduced: 10 Apr 2026
NewCVE-2026-5501 (opens in a new tab)How to fix?
Upgrade wolfssl/wolfssl to version 5.9.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation in the wolfSSL_X509_verify_cert function. An attacker can bypass certificate signature validation by supplying a certificate chain where an untrusted intermediate with Basic Constraints set to CA:FALSE is legitimately signed by a trusted root, allowing the acceptance of a forged leaf certificate. This is only exploitable if the application uses the OpenSSL compatibility API directly, such as in certain integrations with nginx or haproxy.