Vulnerability in Szafir SDK software

CERT Polska has received a report about vulnerability in Szafir SDK software and participated in coordination of its disclosure.

23.07.2026 UPDATE: A CWE has been added and the description has been updated

The vulnerabilityCVE-2026-9058: For untrusted certificates that contain theAuthority Information Access - caIssuers URIextension, Szafir SDK will automatically download the parent CA certificate from the specified URL and will import it to its trust store as anonqualifiedcertificate. In such a case, Szafir SDK returns a success status code of 0 (Positively verified) upon successful cryptographic verification and a certificate status ofnonqualified.

For other types of untrusted certificates, Szafir SDK returns a success status code of 0 (Positively verified) upon successful cryptographic verification and a certificate status ofnondetermined.

This may lead integrating applications to incorrectly treat the digital signature as valid despite an untrusted certificate chain. This flaw enables authentication bypass and user impersonation: (1) in use-cases other than qualified certificate authentication, or (2) if the qualified certificate authentication use-case is not correctly implemented by the integrating application.

This issue was fixed in version 1.8.463.2.

We thank Michał Leszczyński (icedev.pl) for the responsible vulnerability report.