CVE-2026-9058

Summary

For untrusted certificates that contain the "Authority Information Access - caIssuers URI" extension, Szafir SDK will automatically download the parent CA certificate from the specified URL and will import it to its trust store as a "nonqualified" certificate. In such a case, Szafir SDK returns a success status code of 0 ("Positively verified") upon successful cryptographic verification and a certificate status of "nonqualified".

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 of "nondetermined".

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.

Affected Software

Weaknesses

• CWE-637: CWE-637 Unnecessary Complexity in Protection Mechanism (Not Using 'Economy of Mechanism')
• CWE-393: CWE-393: Return of Wrong Status Code
• CWE-295: CWE-295 Improper Certificate Validation

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

References

• https://cert.pl/posts/2026/05/CVE-2026-9058
• https://www.elektronicznypodpis.pl/

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