Medium
netty — security advisory
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certificate revocation checks, allowing applications using Netty's OCSP Client to accept certificates that should have been revoked, leading to an authorization bypass.
- Products
- netty
- Affected versions
- 1:3.2.6.Final-2, 1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1, 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1, 1:4.0.32-1, 1:4.0.33-1, 1:4.0.34-1, 1:4.0.34-1ubuntu0.1~esm1, 1:4.0.34-1ubuntu0.1~esm2, 1:4.0.34-1ubuntu0.1~esm3, 1:4.0.34-1ubuntu0.1~esm4, 1:4.0.34-1ubuntu0.1~esm5, 1:4.1.33-1, 1:4.1.33-2, 1:4.1.33-3, 1:4.1.45-1, 1:4.1.45-1ubuntu0.1~esm1, 1:4.1.45-1ubuntu0.1~esm2, 1:4.1.45-1ubuntu0.1~esm3, 1:4.1.45-1ubuntu0.1~esm4, 1:4.1.45-1ubuntu0.1~esm6, 1:4.1.45-1ubuntu0.1~esm7, 1:4.1.48-10, 1:4.1.48-11, 1:4.1.48-12, 1:4.1.48-13, 1:4.1.48-14, 1:4.1.48-16, 1:4.1.48-16ubuntu0.1~esm2, 1:4.1.48-16ubuntu1, 1:4.1.48-4, 1:4.1.48-4+deb11u1build0.22.04.1, 1:4.1.48-4+deb11u2build0.22.04.1, 1:4.1.48-4+deb11u2ubuntu0.1, 1:4.1.48-4+deb11u2ubuntu0.1+esm1, 1:4.1.48-4+deb11u2ubuntu0.1+esm3, 1:4.1.48-4+deb11u2ubuntu0.1~esm1, 1:4.1.48-4+deb11u2ubuntu0.1~esm2, 1:4.1.48-4+deb11u2ubuntu0.2, 1:4.1.48-4+deb11u2ubuntu0.2+esm1, 1:4.1.48-7, 1:4.1.48-8, 1:4.1.48-9, 1:4.1.48-9ubuntu0.1, 1:4.1.48-9ubuntu0.1+esm1, 1:4.1.48-9ubuntu0.1+esm3, 1:4.1.48-9ubuntu0.1~esm1, 1:4.1.48-9ubuntu0.1~esm2, 1:4.1.48-9ubuntu0.2, 1:4.1.48-9ubuntu0.2+esm1, 1:4.1.48-9ubuntu0.2+esm2, 1:4.1.7-4, 1:4.1.7-4ubuntu0.1, 1:4.1.7-4ubuntu0.1+esm1, 1:4.1.7-4ubuntu0.1+esm2, 1:4.1.7-4ubuntu0.1+esm3, 1:4.1.7-4ubuntu0.1+esm4, 1:4.1.7-4ubuntu0.1+esm5, 1:4.1.7-4ubuntu0.1+esm6, 1:4.1.7-4ubuntu0.1+esm7, 1:4.1.7-4ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93578
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:32 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-93578
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
Complete source record
{
"id": "97af580846481faeed7e5d73313b99564924671ec35b87af8d0ee64a76656ace",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93578",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-93578",
"summary": "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.",
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{
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{
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"binaries": [
{
"binary_name": "libnetty-buffer-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
},
{
"binary_name": "libnetty-common-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
},
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
}
]
}
}
],
"modified": "2026-10-17T13:01:18.369211008Z",
"provider": "osv",
"upstream": [
"CVE-2026-93578"
],
"references": [
"https://ubuntu.com/security/CVE-2026-93578",
"https://www.cve.org/CVERecord?id=CVE-2026-93578",
"https://bugzilla.redhat.com/show_bug.cgi?id=2536969",
"https://github.com/netty/netty/security/advisories/GHSA-jhjp-5q4f-8wr2",
"https://access.redhat.com/security/cve/CVE-2026-93578"
]
},
"related_cves": [
{
"value": "CVE-2026-93578",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361581,
"published_at": "2026-09-18T11:17:00+00:00"
}