CVE-2026-93578
MEDIUMDescription
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certificate revocation checks, allowing applications using Netty's OCSP Client to accept certificates that should have been revoked, leading to an authorization bypass.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Exploit Intelligence
EPSS data unavailable for this CVE.
References
Related Vulnerabilities
Other CWE-1035 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2026-93579 | Medium | 6.5 | - | - | - |
| CVE-2026-93575 | High | 7.5 | - | - | - |
| CVE-2026-93566 | Medium | 6.5 | - | - | - |
| CVE-2026-93565 | High | 7.5 | - | - | - |
| CVE-2026-93564 | High | 7.5 | - | - | - |
| CVE-2026-93563 | High | 7.5 | - | - | - |
Common questions
How do I fix CVE-2026-93578?
No published fix for CVE-2026-93578 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
How severe is CVE-2026-93578?
CVE-2026-93578 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-18.