CVE-2026-40542

HIGH

Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification

Title source: cna
STIX 2.1

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.

References (5)

Core 5

Scores

CVSS v3 7.3
EPSS 0.0046
EPSS Percentile 36.6%
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 CWE-325
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