Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.8%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2026-64607
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cpe:2.3:a:apache:httpclient:5.0.0
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cpe:2.3:a:apache:httpclient:5.0.1
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cpe:2.3:a:apache:httpclient:5.0.2
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cpe:2.3:a:apache:httpclient:5.0.3
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cpe:2.3:a:apache:httpclient:5.4
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cpe:2.3:a:apache:httpclient:5.4.1
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cpe:2.3:a:apache:httpclient:5.4.2
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cpe:2.3:a:apache:httpclient:5.4.3
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cpe:2.3:a:apache:httpclient:5.4.4
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cpe:2.3:a:apache:httpclient:5.5
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cpe:2.3:a:apache:httpclient:5.5.1
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cpe:2.3:a:apache:httpclient:5.5.2
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cpe:2.3:a:apache:httpclient:5.6
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cpe:2.3:a:apache:httpclient:5.6.1
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cpe:2.3:a:apache:httpclient:5.6.2