CVE-2026-40542
Published:April 22, 2026
Updated:May 18, 2026
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.
Affected Packages
org.apache.httpcomponents.client5:httpclient5 (JAVA):
Affected version(s) >=5.6-alpha1 <5.6.1Fix Suggestion:
Update to version 5.6.1org.apache.httpcomponents.client5:httpclient5 (JAVA):
Affected version(s) =5.6 <5.6.1Fix Suggestion:
Update to version 5.6.1Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Missing Critical Step in Authentication
EPSS
Base Score:
0.10