CVE-2026-40542

Published: Apr 22, 2026Modified: Jul 15, 2026

7.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Exploitability: 3.9 / Impact: 3.4

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Affected (1)

Products: Apache: Httpclient

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Apache Httpclient	Version 5.6

Related CWEs

Missing Critical Step in Authentication

The product implements an authentication technique, but it skips a step that weakens the technique.

Missing Cryptographic Step

The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.

References (5)

https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97

Source: security@apache.org

Mailing ListVendor Advisory

http://www.openwall.com/lists/oss-security/2026/04/22/5

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing ListThird 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

Timeline

No history available yet.