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NVD Vulnerability Details :
CVE-2026-40542
Analyzed
More InfoOfficial Page
Source-security@apache.org
View Known Exploited Vulnerability (KEV) details
Published At-22 Apr, 2026 | 08:16
Updated At-01 May, 2026 | 17:12

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Type: Secondary
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
CPE Matches
The Apache Software Foundation
apache
>>httpclient>>5.6
cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-304Secondarysecurity@apache.org
CWE ID: CWE-304
Type: Secondary
Source: security@apache.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97security@apache.org
Mailing List
Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/22/5af854a3a-2127-422b-91ae-364da2661108
Mailing List
Third Party Advisory
Hyperlink: https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
Source: security@apache.org
Resource:
Mailing List
Vendor Advisory
Hyperlink: http://www.openwall.com/lists/oss-security/2026/04/22/5
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Mailing List
Third Party Advisory
Change History
0Changes found
Details not found