Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification

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Summary

CVECVE-2026-40542
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 08:16:12 UTC
Updated2026-04-22 08:16:12 UTC
DescriptionMissing 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.

Risk And Classification

Problem Types: CWE-304 | CWE-304 CWE-304: Missing Critical Step in Authentication

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache HttpClient affected 5.6 5.6.1 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 [email protected] lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Rasmus Moorats (en)

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