High [CVE-2026-56820] Certificate revocation bypass via OCSP response replay attack
This high-severity Red Hat Linux advisory covers CVE-2026-56820 affecting Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16, Red Hat Data Grid 8.6.3.
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Summary
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.
A flaw was found in Netty. The `OcspClient` component fails to validate that the Certificate ID in an Online Certificate Status Protocol (OCSP) response matches the requested Certificate ID.
This can result in the acceptance of revoked certificates, potentially compromising the integrity and confidentiality of communications. This is an Important flaw in Netty's `OcspClient` that could allow a remote attacker to bypass certificate revocation checks.
Exploitation requires high attack complexity, indicating specific conditions or attacker preparation. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).
Weakness: CWE-295. Affected Red Hat products: Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16; Red Hat Data Grid 8.6.3.
- < 4.2.0.Final
- < 4.2.15.Final
- < 4.1.135.Final
- 4.2.0
- 4.2.15
- 4.1.135
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
- 4.1.136
- 4.2.16
- netty-handler-ssl-ocsp
- RHSA-2026:54622
- RHSA-2026:69296
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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