CVE-2026-40542— Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification
Quick assessment
Affected
Apache Software Foundation Apache HttpClient
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 HttpClient是美国阿帕奇（Apache）基金会的一个 Java 编写的访问HTTP资源的客户端程序。该程序用于使用HTTP协议访问网络资源。 Apache HttpClient 5.6版本存在安全漏洞，该漏洞源于身份验证中缺少关键步骤，可能导致攻击者使客户端在没有适当相互身份验证验证的情况下接受SCRAM-SHA-256身份验证。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache HttpClient | 5.6< 5.6.1 |
affected |
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I. Basic Information for CVE-2026-40542
Vulnerability Information
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Vulnerability Title
Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification
Source: CVE Program / CVE List V5
Vulnerability Description
Missing critical step in authentication in Apache HttpClient 5.6 allows an attacker to cause the client to accept SCRAM-SHA-256 authentication without proper mutual authentication verification. Users are recommended to upgrade to version 5.6.1, which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
认证中关键步骤缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HttpClient 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HttpClient是美国阿帕奇（Apache）基金会的一个 Java 编写的访问HTTP资源的客户端程序。该程序用于使用HTTP协议访问网络资源。 Apache HttpClient 5.6版本存在安全漏洞，该漏洞源于身份验证中缺少关键步骤，可能导致攻击者使客户端在没有适当相互身份验证验证的情况下接受SCRAM-SHA-256身份验证。
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 HttpClient | 5.6 ~ 5.6.1 | - |
|
II. Public POCs for CVE-2026-40542
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same vendor: Apache Software Foundation
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V. Comments for CVE-2026-40542
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