CVE-2026-40542

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 Vector

References

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