CVE-2026-64607
Received Received - Intake

Apache HttpClient Connection Leak via Invalid Content-Encoding

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: Apache Software Foundation

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.

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Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-64607
EUVD
EUVD-2026-51519

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apache httpcomponents_client From 5.0-alpha1 (inc) to 5.6.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-772 The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.

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Executive Summary

This vulnerability affects Apache HttpComponents Client versions 5.0-alpha1 through 5.6.2. It occurs when the HttpClient, which uses the classic I/O model, fails to properly release the underlying connection back to the connection manager if the response contains an invalid or unsupported Content-Encoding header value.

Detection Guidance

This vulnerability can be detected by checking the Apache HttpComponents Client version in use. If your system runs versions 5.0-alpha1 through 5.6.2, it is affected. No specific commands are provided for detection beyond version verification.

Impact Analysis

This issue could lead to a resource leak where connections are not properly closed and returned to the pool. This may cause the application to run out of available connections, leading to performance degradation or denial of service.

Mitigation Strategies

Upgrade Apache HttpComponents Client to a version beyond 5.6.2 to resolve the issue. If using async i/o model, no action is needed as it is not affected.

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