GitHub Advisoryadvisory · Maven
GHSA-hjcp-jmpx-g3qm Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
MEDIUM
Official page ↗
- Aliases
- CVE-2026-64607
- Ecosystem
- Maven
- Packages
- org.apache.httpcomponents.client5:httpclient5
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-772
- Reviewed
- 2026-08-13
Affected packages
• Maven org.apache.httpcomponents.client5:httpclient5: >= 5.0-alpha1, < 5.6.3 → fixed in 5.6.3
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.
Related
Alias · CVE (1)
- CVE-2026-64607 HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it… vulnerability
Weakness · CWE (1)
- CWE-772 Missing Release of Resource after Effective Lifetime weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-64607 advisory
- https://github.com/apache/httpcomponents-client/commit/55733f4121f7ba26ddf04fe12739d9c15962cb94 web
- https://github.com/apache/httpcomponents-client/commit/ebac9512f555c4a355cad3f59ef2db69b597cc97 web
- https://github.com/apache/httpcomponents-client package
- https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.6.3 web
- https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.7-alpha1 web
- https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q web
- http://www.openwall.com/lists/oss-security/2026/08/13/5 web