Missing Release of Resource after Effective Lifetime Affecting org.apache.httpcomponents.client5:httpclient5 package, versions [5.0-alpha1,5.6.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JAVA-ORGAPACHEHTTPCOMPONENTSCLIENT5-18857813
- published16 Aug 2026
- disclosed31 Jul 2026
- creditUnknown
Introduced: 31 Jul 2026
NewCVE-2026-64607 (opens in a new tab)How to fix?
Upgrade org.apache.httpcomponents.client5:httpclient5 to version 5.6.3 or higher.
Overview
org.apache.httpcomponents.client5:httpclient5 is a HttpClient component of the Apache HttpComponents project.
Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime via the ContentCompressionExec response decoding path in httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/ContentCompressionExec.java. An attacker can exhaust the connection pool by sending a response with an invalid or unsupported Content-Encoding header that causes decoding to fail. When the classic I/O client raises the exception, it leaves the underlying response stream and connection unreleased, so pooled connections remain tied up and subsequent requests stall or fail.