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.

PUBLISHED Reserved 2026-04-14 | Published 2026-04-22 | Updated 2026-04-22 | Assigner apache

Problem types

CWE-304: Missing Critical Step in Authentication

Product status

Credits

Rasmus Moorats finder

References

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

lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 vendor-advisory

cve.org (CVE-2026-40542)

nvd.nist.gov (CVE-2026-40542)

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