Bug 2505982 (CVE-2026-56820) - CVE-2026-56820 io.netty/netty-handler-ssl-ocsp: Netty: Certificate revocation bypass via OCSP response replay attack
Summary: CVE-2026-56820 io.netty/netty-handler-ssl-ocsp: Netty: Certificate revocation...
Keywords:
Status: NEW
Alias: CVE-2026-56820
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 23:04 UTC by OSIDB Bzimport
Modified: 2026-08-13 14:51 UTC (History)
27 users (show)

Fixed In Version:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:54622 0 None None None 2026-08-13 14:51:45 UTC

Description OSIDB Bzimport 2026-07-21 23:04:13 UTC 
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.
Comment 1 errata-xmlrpc 2026-08-13 14:51:43 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16

Via RHSA-2026:54622 https://access.redhat.com/errata/RHSA-2026:54622
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