Quick answers
- Is CVE-2026-93578 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93578 being exploited in the wild.
- How severe is CVE-2026-93578?
- Medium severity, with a CVSS score of 5.9, published 18 September 2026.
- Which products and versions are affected?
- Netty unknown.
- Is there a fix for CVE-2026-93578?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-93578 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-93578?
- Check whether you run Netty at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authentication/authorization bypass caused by insufficient validation of OCSP responder certificates. Netty's OCSP Client fails to verify the 'id-kp-OCSPSigning' Extended Key Usage (EKU) extension on certificates presented by OCSP responders. An attacker holding any valid certificate issued by the same Certificate Authority can forge OCSP responses indicating revoked certificates are "GOOD", bypassing certificate revocation checks. This requires network access to intercept or control OCSP responses, but no specific authentication is required from the application. The impact is that applications relying on Netty's OCSP validation will incorrectly trust revoked certificates. No patch information is currently available.
Affected products
- Netty Netty unknown
Timeline
- 2026-09-18: disclosed