CVE-2026-40542
Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification
CVSS Score
7.3
EPSS Score
0.0%
EPSS Percentile
0th
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 |
| Vendor | apache software foundation |
| Product | apache httpclient |
| Published | Apr 22, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
Apache Software Foundation / Apache HttpClient
5.6 < 5.6.1
References
lists.apache.org: https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/22/5 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-40542 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2460518 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json
Credits
Rasmus Moorats