Apache HttpClient accepts SCRAM-SHA-256 authentication without proper mutual authentication verification
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.httpcomponents.client5:httpclient5 | >= 5.6-alpha1, < 5.6.1 | 5.6.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-40542
- https://github.com/apache/httpcomponents-client/commit/726eac2323d370435d8afca1e0540aa099927f18
- https://github.com/apache/httpcomponents-client
- https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
- http://www.openwall.com/lists/oss-security/2026/04/22/5
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-304- Platform
- Java / Kotlin (Maven)
- Package
org.apache.httpcomponents.client5:httpclient5- Disclosed
- 22.04.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-v468-qcjx-r72w - CC BY 4.0
Vulnerability history: org.apache.httpcomponents.client5:httpclient5
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 04.2025 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2025: 1
- 2026: 2
-
Apache HttpClient accepts SCRAM-SHA-256 authentication without proper mutual authentication verification this entry
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