CVE-2026-40542

HIGH

7.3

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.

CVE Details

CVSS v3.1 Score7.3

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/22/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-304

References

https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97(security@apache.org)

http://www.openwall.com/lists/oss-security/2026/04/22/5(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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