CVE-2026-40542

high Apache
CVSS v3 Base Score
7.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS Score
0.1%
Exploitation probability in 30 days
Top 73% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Published: April 22, 2026 (22 days ago)
Last Modified: May 1, 2026
Vendor: Apache
Source: 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.

CWE

CWE-304

Affected Products

apache httpclient

References

🔗 lists.apache.org 🔗 www.openwall.com