CVE-2026-64607

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

Published Jul 31, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported `Content-Encoding` header value in the response message. Please note this defect does not affect HttpClient based on the async i/o model.

This issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-hjcp-jmpx-g3qm Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
History
Type Values Removed Values Added
First Time appeared Apache
Apache httpcomponents Client
Vendors & Products Apache
Apache httpcomponents Client
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported `Content-Encoding` header value in the response message. Please note this defect does not affect HttpClient based on the async i/o model. This issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2.
Title Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
Weaknesses CWE-772
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Aug 13, 2026, 4:18 PM
Reserved
Jul 20, 2026, 8:23 AM
Status
Modified
Published
Jul 31, 2026, 11:17 AM
Modified
Oct 23, 2026, 11:10 PM