CVE-2026-40542
HIGHApache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
Scores
CVSS v3
7.3
EPSS
0.0005
EPSS Percentile
17.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-304
Status
published
Products (3)
apache/httpclient
5.6
Apache Software Foundation/Apache HttpClient
5.6 - 5.6.1
org.apache.httpcomponents.client5/httpclient5
5.6-alpha1 - 5.6.1Maven
Published
Apr 22, 2026
Tracked Since
Apr 22, 2026