CVE-2026-40542

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.

CVSS v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97	Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/22/5	Mailing List Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:60239
https://access.redhat.com/errata/RHSA-2026:60246
https://access.redhat.com/errata/RHSA-2026:60247
https://access.redhat.com/errata/RHSA-2026:60248
https://access.redhat.com/errata/RHSA-2026:60249
https://access.redhat.com/errata/RHSA-2026:60250
https://access.redhat.com/errata/RHSA-2026:60251
https://access.redhat.com/errata/RHSA-2026:60252
https://access.redhat.com/errata/RHSA-2026:60254
https://access.redhat.com/errata/RHSA-2026:60256
https://access.redhat.com/errata/RHSA-2026:60259
https://access.redhat.com/security/cve/CVE-2026-40542
https://bugzilla.redhat.com/show_bug.cgi?id=2460518
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-22 08:16

Updated : 2026-09-09 13:19

NVD link : CVE-2026-40542

Mitre link : CVE-2026-40542

CVE.ORG link : CVE-2026-40542

JSON object : View

Products Affected

apache

httpclient

CWE

CWE-304

Missing Critical Step in Authentication

CWE-325

Missing Cryptographic Step

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{"url": "https://access.redhat.com/errata/RHSA-2026:60246", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60247", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60248", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60249", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60250", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60251", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60252", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60254", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60256", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60259", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-40542", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460518", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-304"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-325"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-09T13:19:50.873", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0E0B553E-826B-4260-80BD-3151F3FAFE07"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}