CVE-2026-40542

HIGH EPSS 42.5%
Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago
7.3 CVSS 3.1
High
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.3
Exploitability
3.9
Impact
3.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability Low

Threat Intelligence

EPSS Exploit Probability
42.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-304

Affected Products 1

VendorProductVersionRange
apachehttpclient5.6any

References 2

  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/22/5
    Mailing ListThird Party Advisory
  • lists.apache.org https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
    Mailing ListVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.