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CVE Vulnerability Details :
CVE-2026-40542
PUBLISHED
More InfoOfficial Page
Assigner-apache
Assigner Org ID-f0158376-9dc2-43b6-827c-5f631a4d8d09
View Known Exploited Vulnerability (KEV) details
Published At-22 Apr, 2026 | 07:07
Updated At-22 Apr, 2026 | 16:23
Rejected At-
▼CVE Numbering Authority (CNA)
Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification

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 Products
Vendor
The Apache Software FoundationApache Software Foundation
Product
Apache HttpClient
Collection URL
https://repo.maven.apache.org/maven2
Package Name
org.apache.httpcomponents.client5:httpclient5
Default Status
unaffected
Versions
Affected
  • From 5.6 before 5.6.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-304CWE-304: Missing Critical Step in Authentication
Type: CWE
CWE ID: CWE-304
Description: CWE-304: Missing Critical Step in Authentication
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Textual description of severity
text:
Important
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Rasmus Moorats
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
vendor-advisory
Hyperlink: https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
1. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Version: 3.1
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
2. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/04/22/5
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/04/22/5
Resource: N/A
Details not found