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Advisory record · GHSA-hjcp-jmpx-g3qm

Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS

CVSS 5.3 MediumEPSS 0.0046 · 40th percentile

Published by the GitHub Advisory Database at 31 Jul 2026, 12:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.httpcomponents.client5:httpclient5Maven>=5.0-alpha1, <5.6.35.6.3
Identifiers
GHSA-hjcp-jmpx-g3qm · CVE-2026-64607
Weakness (CWE)
CWE-772
Tags
Published
31 Jul 2026
Updated
10 Sept 2026

Machine-written summary

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

Apache HttpComponents Client 5 (httpclient5) versions 5.0-alpha1 through 5.6.2 fail to release the connection back to the connection manager when a response has an invalid or unsupported Content-Encoding header. This affects only the classic I/O model, not the async model. The source does not describe the exact conditions an attacker needs, but repeated responses of this kind can exhaust the connection pool and cause a denial of service. Upgrade to version 5.6.3.

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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0046, the 40th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.