CVE-2026-93578

Io.netty/netty-handler-ssl-ocsp: netty: missing extended key usage (eku) check in ocsp client allows certificate revocation bypass

State: Published
Severity: 5.9 Medium
Published: Sep 18, 2026
Updated: Sep 18, 2026
Reserved: Sep 18, 2026

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Description

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certificate revocation checks, allowing applications using Netty's OCSP Client to accept certificates that should have been revoked, leading to an authorization bypass.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	redhat

Weaknesses

CWE-1035

Affected Products

Product	Versions
Red Hat build of Apache Camel for Spring Boot 4Red Hat

References

https://access.redhat.com/security/cve/CVE-2026-93578vdb-entry
RHBZ#2536969issue-tracking

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