CVEvulnerability

CVE-2026-56820

9.1 CRITICAL Published 2026-07-21 Modified 2026-07-30 Official page ↗
Status
Analyzed
Published
2026-07-21
Last modified
2026-07-30
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
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-295

Description

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.

Affected configurations

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

Related

Weakness · CWE (1)

  • CWE-295 Improper Certificate Validation weakness

References