CVE-2026-56821

Description

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response to bypass revocation of a since-revoked certificate. Exploitation can lead to certificate revocation bypass via replay of an expired OCSP response. Any application using OcspServerCertificateValidator is affected; a revoked certificate can be accepted. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

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Produits concernés

• netty
• Netty netty

Scores CVSS

Faiblesses (CWE)

• CWE-299

Références

• https://github.com/netty/netty/security/advisories/GHSA-g7hg-vrcf-mvmr ExploitVendor Advisory
• https://github.com/netty/netty/security/advisories/GHSA-g7hg-vrcf-mvmr ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories