CVE Vulnerabilities

CVE-2026-56820

Improper Certificate Validation

Published: Jul 21, 2026 | Modified: Jul 30, 2026
CVSS 3.x
9.1
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
7.4 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Ubuntu
MEDIUM
root.io logo minimus.io logo echo.ai logo

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4.1.135.Final, OcspClient does not validate that the CertificateID in an OCSP response matches the requested CertificateID, which can lead to replay attack. OcspClient.validateResponse accepts a legitimately signed GOOD status response for an unrelated certificate issued by the same CA, allowing bypass of revocation checks for another certificate. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Weakness

The product does not validate, or incorrectly validates, a certificate.

Affected Software

NameVendorStart VersionEnd Version
NettyNetty*4.1.136 (excluding)
NettyNetty4.2.0 (including)4.2.16 (excluding)
Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16RedHatnetty-handler-ssl-ocsp*

Potential Mitigations

References