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  <updated>2026-09-29T08:42:55.114123+00:00</updated>
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  <entry>
    <id>https://vulnerability.circl.lu/vuln/cve-2026-56820</id>
    <title>CVE-2026-56820 — Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks</title>
    <updated>2026-09-29T08:42:55.125586+00:00</updated>
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      <div xmlns="http://www.w3.org/1999/xhtml"><p><strong>Affected:</strong> netty</p>
<p>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.</p></div>
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    <link href="https://vulnerability.circl.lu/vuln/cve-2026-56820"/>
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