Vulnerability intelligence

CVE-2026-71290

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 Score

—

Unrated

EPSS — Exploit Probability

0.2%

Riskier than 6% 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