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Advisory record · GHSA-wc96-39fc-566f

Netty: TOCTOU in OcspServerCertificateValidator

CVSS 7.4 HighEPSS 0.0017 · 6th percentile

Published by the GitHub Advisory Database at 22 Jul 2026, 21:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-handler-ssl-ocspMaven>=4.2.0.Final, <4.2.16.Final || <4.1.136.Final4.2.16.Final, 4.1.136.Final
Identifiers
GHSA-wc96-39fc-566f · CVE-2026-56822
Weakness (CWE)
CWE-367
Tags
Published
22 Jul 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

GHSA-wc96-39fc-566f: Netty's OcspServerCertificateValidator in io.netty:netty-handler-ssl-ocsp, versions 4.2.0.Final up to but not including 4.2.16.Final, and versions up to but not including 4.1.136.Final, forwards the TLS handshake completion event before the asynchronous OCSP revocation check finishes. A malicious server presenting a revoked certificate can receive application data from a client, or send data to it, during the window before the check closes the channel. Upgrade to 4.2.16.Final or 4.1.136.Final.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.4 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0017, the 6th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.