[deps]: Update org.apache.httpcomponents.client5:httpclient5 to v5.6.3 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.httpcomponents.client5:httpclient5 (source)	5.4.3 → 5.6.3

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Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS

CVE-2026-64607 / GHSA-hjcp-jmpx-g3qm

More information

Details

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.

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

• 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
• https://github.com/advisories/GHSA-hjcp-jmpx-g3qm

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

apache/httpcomponents-client (org.apache.httpcomponents.client5:httpclient5)

v5.6.3

v5.6

This is the first ALPHA release in the 5.6 release series. It adds several features
such as transport content decompression and content compression for the async transport,
support for Unix sockets, experimental support for SCRAM-SHA-256 authentication scheme,
and Micrometer/OTel observations & metrics.

Commons Compress, Brotli codec, and ZStd codec are optional dependencies and get
wired into the execution pipeline only if present on the classpath.

Notable changes and features included in the 5.6 series:

• Unix domain socket support.

• Support for pluggable content codecs via Commons-Compress in the classic transport.
  (optional).

• Support for transparent content decompression and content compression with deflate,
  gzip, zstd (optional), and brotli (optional) codecs in the async transport.

• Micrometer/OTel observations & metrics (optinal).

• Off-lock connection disposal by the classic pooling connection manager. Experimental.

• SCRAM-SHA-256 authentication scheme (RFC 7804). Experimental.

• Request Priority support (RFC 9218). Experimental.

Compatibility notes:

• As of this version, HttpClient uses BUILTIN HostnameVerificationPolicy by default, delegating
  host verification to JSSE security manager. One must explicitly configure the TLS strategy
  to continue using the hostname verifier shipped with HttpClient.

• Five-second TCP keep-alive is now enabled by default.

v5.5

This is the first GA release in the 5.5 release series. This release finalizes the 5.5
APIs and adds several experimental features and improvements, such as request multiplexing
over a shared HTTP/2 connection and the Classic API facade acting as a compatibility
bridge between classic I/O client services and the asynchronous message transport used
internally.

Notable changes and features included in the 5.5 series:

• Improved conformance to RFC 7616 (HTTP Digest Access Authentication).

• The connection pool implementation acts as a caching facade in front of a standard
  managed connection pool and shares already leased connections to multiplex message
  exchanges over active HTTP/2 connections. Experimental.

• Extended Auth API and improved authentication protocol logic to support mutual
  authentication.

• The Classic API facade now acts as a compatibility bridge between the classic I/O client
  services (based on the standard InputStream / OutputStream model) and the asynchronous
  message transport used internally. This is experimental.

• HTTP/2 support for the Fluent Facade (via Classic API facade). This is experimental.

Compatibility notes:

• As of this release, HttpClient does not automatically execute redirects if the original
  request manually added headers that are considered sensitive.

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