Httpcomponents Client CVEs and Security Vulnerabilities

CVE-2026-71290

Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)

Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. Please note the classic version of HttpClient is not affected by this vulnerability. Affected users are recommended to upgrade to at least version 5.6.4, which fixes the issue.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed

Vendors

Apache

Products

Httpclient Httpcomponents Client

CVE-2026-64607

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

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 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed