CVE-2026-40542

high

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.

References

Advisories
More

https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97

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

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24630

https://bugzilla.redhat.com/show_bug.cgi?id=2460518

https://access.redhat.com/security/cve/CVE-2026-40542

https://access.redhat.com/errata/RHSA-2026:60259

https://access.redhat.com/errata/RHSA-2026:60256

https://access.redhat.com/errata/RHSA-2026:60254

https://access.redhat.com/errata/RHSA-2026:60252

https://access.redhat.com/errata/RHSA-2026:60251

https://access.redhat.com/errata/RHSA-2026:60250

https://access.redhat.com/errata/RHSA-2026:60249

https://access.redhat.com/errata/RHSA-2026:60248

https://access.redhat.com/errata/RHSA-2026:60247

https://access.redhat.com/errata/RHSA-2026:60246

https://access.redhat.com/errata/RHSA-2026:60239

Details

Source: Mitre, NVD

Published: 2026-04-22

Updated: 2026-09-09

Named Vulnerability: GHSA-v468-qcjx-r72w

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 7.3

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

Severity: High

EPSS

EPSS: 0.00702