CVE-2026-40542

7.3 HIGH
Published: April 22, 2026 Modified: June 30, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
Source: security@apache.org
Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/22/5
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-40542
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2460518
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.3 / 10.0
EPSS (Exploit Probability)
0.5%
36th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-304 CWE-325

Affected Vendors

apache

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