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Advisory record · GHSA-c653-97m9-rcg9

Netty: Wrapping plain trust manager silently disables hostname verification

CVSS 7.5 HighEPSS 0.0049 · 42nd percentile

Published by the GitHub Advisory Database at 15 Jun 2026, 20:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-handlerMaven>=4.2.0.Final, <4.2.15.Final || <4.1.135.Final4.2.15.Final, 4.1.135.Final
Identifiers
GHSA-c653-97m9-rcg9 · CVE-2026-50010
Weakness (CWE)
CWE-347
Tags
Published
15 Jun 2026
Updated
10 Sept 2026

Machine-written summary

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

Netty's netty-handler package, versions 4.2.0.Final up to but not including 4.2.15.Final, and 4.1.x versions before 4.1.135.Final, is affected. When a plain X509TrustManager is supplied through SimpleTrustManagerFactory, the wrapper discards the SSL engine during certificate checks, so hostname verification is silently skipped even when endpoint identification is set to HTTPS by default. An attacker able to present a certificate trusted by that manager, such as through a network position between client and server, could impersonate a server. Upgrade to 4.2.15.Final or 4.1.135.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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0049, the 42nd percentile, on 9 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.