MEDIUM 5.3
GHSA-hjcp-jmpx-g3qm
Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS
Quick fix
GHSA-hjcp-jmpx-g3qm — org.apache.httpcomponents.client5:httpclient5: upgrade to the fixed version with the command below.
# pom.xml: bump <version>5.6.3</version> for org.apache.httpcomponents.client5:httpclient5Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
Maven / org.apache.httpcomponents.client5:httpclient5
Introduced in:
5.0-alpha1 Fixed in: 5.6.3 Fix
# pom.xml: bump <version>5.6.3</version> for org.apache.httpcomponents.client5:httpclient5 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]