CVE-2026-40542

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-40542
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.

7.3 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/22/5 Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:*
History

01 May 2026, 17:12

Type Values Removed Values Added
CPE cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:*
First Time Apache httpclient
Apache
References () https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 - () https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 - Mailing List, Vendor Advisory
References () http://www.openwall.com/lists/oss-security/2026/04/22/5 - () http://www.openwall.com/lists/oss-security/2026/04/22/5 - Mailing List, Third Party Advisory

22 Apr 2026, 17:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/04/22/5 -

22 Apr 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.3

22 Apr 2026, 08:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-22 08:16

Updated : 2026-05-01 17:12

NVD link : CVE-2026-40542

Mitre link : CVE-2026-40542

CVE.ORG link : CVE-2026-40542

JSON object : View

Products Affected

apache

  • httpclient
CWE
CWE-304

Missing Critical Step in Authentication