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Advisory record · GHSA-v468-qcjx-r72w

Apache HttpClient accepts SCRAM-SHA-256 authentication without proper mutual authentication verification

CVSS 7.3 HighEPSS 0.0054 · 45th percentile

Published by the GitHub Advisory Database at 22 Apr 2026, 09:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.httpcomponents.client5:httpclient5Maven>=5.6-alpha1, <5.6.15.6.1
Identifiers
GHSA-v468-qcjx-r72w · CVE-2026-40542
Weakness (CWE)
CWE-304 · CWE-325
Tags
Published
22 Apr 2026
Updated
10 Sept 2026

Machine-written summary

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

Apache HttpClient 5 (org.apache.httpcomponents.client5:httpclient5) versions 5.6-alpha1 up to but not including 5.6.1 is affected. The source describes a missing step in authentication that lets an attacker cause the client to accept SCRAM-SHA-256 authentication without proper mutual authentication verification. Upgrade to httpclient5 version 5.6.1, which fixes the issue.

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
7.3 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0054, the 45th percentile, on 5 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.