CVE-2026-64607 Details
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.
A resource management vulnerability has been identified in Apache HttpComponents Client versions 5.0-alpha1 prior to 5.6.2. This issue arises in the classic I/O model, where the client fails to properly release the underlying connection back to the connection manager upon encountering an invalid or unsupported 'Content-Encoding' header value in the response. As a result, connections may be improperly managed, potentially leading to resource leaks. This vulnerability does not affect the asynchronous I/O model.
Users can upgrade to Apache HttpComponents Client version 5.6.3, which addresses this vulnerability. The updated version can be downloaded from the Apache HttpComponents website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/08/13/5 | CVE | |
| https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q | [email protected] | Mailing ListRelease Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-772 | Missing Release of Resource after Effective Lifetime | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| apache httpclient | >= 5.0.0, < 5.6.3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 13, 2026 | CVE Modified | CVE |
| Aug 10, 2026 | Initial Analysis | [email protected] |
| Jul 31, 2026 | CVE Modified | CISA-ADP |
| Jul 31, 2026 | New CVE Received | [email protected] |