CVE-2026-64607: CWE-772 Missing Release of Resource after Effective Lifetime in Apache Software Foundation Apache HttpComponents Client
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.
AI Analysis
Technical Summary
CVE-2026-64607 is a resource management vulnerability in Apache HttpComponents Client based on the classic I/O model. When the client receives a response with an invalid or unsupported Content-Encoding header, it fails to release the underlying connection back to the connection manager, potentially causing resource exhaustion. This defect does not impact the async I/O model of HttpClient. The affected versions are from 5.0-alpha1 through 5.6.2.
Potential Impact
The vulnerability can lead to resource leaks by not releasing connections properly, which may degrade service availability or performance over time. There is no impact on confidentiality or integrity, and no known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider using the async I/O model of HttpClient as it is not affected by this issue.
CVE-2026-64607: CWE-772 Missing Release of Resource after Effective Lifetime in Apache Software Foundation Apache HttpComponents Client
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.
CVSS v3.1
Score 5.3medium
Affected software
Apache Software Foundation
Apache HttpComponents Client
pkg:maven/Apache Software Foundation/org.apache.httpcomponents.client5:httpclient5Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-64607 is a resource management vulnerability in Apache HttpComponents Client based on the classic I/O model. When the client receives a response with an invalid or unsupported Content-Encoding header, it fails to release the underlying connection back to the connection manager, potentially causing resource exhaustion. This defect does not impact the async I/O model of HttpClient. The affected versions are from 5.0-alpha1 through 5.6.2.
Potential Impact
The vulnerability can lead to resource leaks by not releasing connections properly, which may degrade service availability or performance over time. There is no impact on confidentiality or integrity, and no known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider using the async I/O model of HttpClient as it is not affected by this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-07-20T08:23:45.493Z
- State
- PUBLISHED
Threat ID: 6a6c777c9c2644c7f8ab1bb1
Added to database: 07/31/2026, 10:22:52 UTC
Last enriched: 08/15/2026, 14:30:48 UTC
Last updated: 09/13/2026, 22:01:36 UTC
Views: 70
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