medium5.3
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 encounters an invalid or un…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.apache.httpcomponents.client5:httpclient5 | >= 5.0-alpha1, < 5.6.3 | 5.6.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apache | Httpclient | from 5.0.0 before 5.6.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hjcp-jmpx-g3qm
- https://nvd.nist.gov/vuln/detail/CVE-2026-64607
- https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q
- https://github.com/apache/httpcomponents-client/commit/55733f4121f7ba26ddf04fe12739d9c15962cb94
- https://github.com/apache/httpcomponents-client/commit/ebac9512f555c4a355cad3f59ef2db69b597cc97
- https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.6.3
- https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.7-alpha1
- http://www.openwall.com/lists/oss-security/2026/08/13/5