CVE-2026-64607: org.apache.httpcomponents.client5:httpclient5:jar:5.6:test

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Summary

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.

CVE: CVE-2026-64607
CWE: CWE-772

References

• https://guide.sonatype.com/vulnerability/CVE-2026-64607?component-type=maven&component-name=org.apache.httpcomponents.client5%2Fhttpclient5&utm_source=ossindex-client&utm_medium=integration&utm_content=1.8.1
• http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2026-64607
• GHSA-hjcp-jmpx-g3qm