CVE-2026-93578

5.9 mediumEPSS 0.2%

Medium (5.9). EPSS 0.2% chance of exploitation in the next 30 days.

A flaw was found in Netty's Online Certificate Status Protocol (OCSP) Client. The client fails to verify the 'id-kp-OCSPSigning' Extended Key Usage (EKU) in OCSP responder certificates. A remote attacker, holding any valid certificate issued by the same Certificate Authority (CA), can exploit this by forging 'GOOD' OCSP responses for revoked certificates. This bypasses certificate revocation checks, allowing applications using Netty's OCSP Client to accept certificates that should have been revoked, leading to an authorization bypass.

Severity

CVSS 3.1

5.9 medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-31)
CWE: CWE-1035
Published: 2026-09-18
Modified: 2026-09-18
Record from: the NVD, synced 2026-10-19

References

https://access.redhat.com/security/cve/CVE-2026-93578
https://bugzilla.redhat.com/show_bug.cgi?id=2536969
https://access.redhat.com/security/cve/CVE-2026-93578

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