PT-2026-34264 · Apache · Apache Httpclient

Rasmus Moorats · Published 2026-04-22 · Updated 2026-05-01 · CVE-2026-40542

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Apache HttpClient version 5.6

Description A missing critical step in authentication allows an attacker to cause the client to accept SCRAM-SHA-256 authentication without proper mutual authentication verification.

Recommendations Upgrade to version 5.6.1.

Fix

Weakness Enumeration

CWE-304

Related Identifiers

CVE-2026-40542

GHSA-V468-QCJX-R72W

Affected Products

Apache Httpclient

References · 13

• https://cve.org/CVERecord?id=CVE-2026-40542 · Security Note
• https://ubuntu.com/security/CVE-2026-40542 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40542 · Security Note
• https://osv.dev/vulnerability/GHSA-v468-qcjx-r72w · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-40542 · Vendor Advisory
• https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 · Vendor Advisory
• https://github.com/apache/httpcomponents-client/commit/726eac2323d370435d8afca1e0540aa099927f18 · Note
• https://github.com/apache/httpcomponents-client · Note
• https://twitter.com/oss_security/status/2048939068717711609 · Twitter Post
• https://twitter.com/CVEnew/status/2047428147747156085 · Twitter Post
• https://twitter.com/the_yellow_fall/status/2047308508811472980 · Twitter Post
• https://t.me/cveNotify/161784 · Telegram Post
• http://openwall.com/lists/oss-security/2026/04/22/5 · Note