CVE-2026-71290

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

Published: Aug 11, 2026Updated: Aug 17, 2026 Sources: CVE List NVDCWE-295

9.1CRITICAL

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-295

Affected Products

Apache Software Foundation

oss-project·USaka apache foundation

Apache HttpComponents ClientMixed

Web & CMS Plugins / cms-core

apache

oss-project·USaka apache http server, apache httpd

httpclientLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq

lists.apache.org

http://www.openwall.com/lists/oss-security/2026/08/13/6

openwall.com

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