Vulnerability intelligence

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.

CVSS Score

—

Unrated

EPSS — Exploit Probability

0.4%

Riskier than 29% of all CVEs

Exploitation

Not in CISA KEV

No federal exploitation record

Remediation

Patch available

Vendor fix published

NVD entry Vendor patch

1 article across 1 outlet · first covered Aug 18, 2026 · latest Aug 18, 2026

Coverage timeline

Apache HttpClient bug lets attackers hijack traffic, update urged
securityonline.info · Aug 18, 2026