Invalid certificate policies in leaf certificates are silently ignored

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Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether. Policy processing is disabled by default but can be enabled by passing the `-policy' argument to the command line utilities or by calling the `X509_VERIFY_PARAM_set1_policies()' function.

Source published

28 Mar 2023 14:30:39 UTC

Source modified

14 Oct 2026 19:54:20 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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