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CVE-2026-71290— Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)

Quick assessment

Affected
Apache Software Foundation Apache HttpComponents Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache HttpComponents Client是美国Apache基金会的一款实现HTTP协议通信的客户端库。 Apache HttpComponents Client 5.4至5.6.3版本存在加密问题漏洞，该漏洞源于TLS主机名验证不当，HostnameVerificationPolicy#BUILTIN设置对async版本HttpClient无效，攻击者可通过拦截和修改客户端与服务器之间的流量，提供其他域的有效证书来冒充服务器。

AI Predicted 5.9 Difficulty: Easy EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1557.002 · ARP Cache Poisoning

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache HttpComponents Client 5.4-alpha≤ 5.6.3 affected
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I. Basic Information for CVE-2026-71290

Vulnerability Information
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Vulnerability Title
Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HttpComponents Client 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HttpComponents Client是美国Apache基金会的一款实现HTTP协议通信的客户端库。 Apache HttpComponents Client 5.4至5.6.3版本存在加密问题漏洞，该漏洞源于TLS主机名验证不当，HostnameVerificationPolicy#BUILTIN设置对async版本HttpClient无效，攻击者可通过拦截和修改客户端与服务器之间的流量，提供其他域的有效证书来冒充服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache HttpComponents Client 5.4-alpha ~ 5.6.3 -

II. Public POCs for CVE-2026-71290

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III. Intelligence Information for CVE-2026-71290

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Mailing List Discussions for CVE-2026-71290 (1)

IV. Related Vulnerabilities

Same product: Apache HttpComponents Client
Same vendor: Apache Software Foundation
Same weakness: CWE-295