CVEvulnerability

CVE-2026-56821

7.4 HIGH Published 2026-07-29 Modified 2026-08-07 Official page ↗
Status
Analyzed
Published
2026-07-29
Last modified
2026-08-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-299

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 Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response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.

Affected configurations

• netty netty (< 4.1.136) • netty netty (>= 4.2.0 < 4.2.16)

Related

Weakness · CWE (1)

  • CWE-299 Improper Check for Certificate Revocation weakness

References