7.3
HIGH
CVSS 3.1
CVE-2026-40542
Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification
Overview
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.
Details
INFO
Published Date :
April 22, 2026, 8:16 a.m.
Last Modified :
July 15, 2026, 2:21 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
Upgrade Apache HttpClient to 5.6.1 to address SCRAM-SHA-256 authentication bypass.
- Upgrade Apache HttpClient to version 5.6.1.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40542.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/04/22/5 | Mailing List Third Party Advisory |
| https://access.redhat.com/security/cve/CVE-2026-40542 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2460518 | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40542 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40542
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40542 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40542 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
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'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 7', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 7', 'packageName': 'httpclient-cache', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 7', 'packageName': 'httpclient-osgi', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 7', 'packageName': 'httpclient-win', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'packageName': 'httpclient-cache', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'packageName': 'httpclient-osgi', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'packageName': 'httpclient-win', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'packageName': 'httpclient-cache', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'packageName': 'httpclient-osgi', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'packageName': 'httpclient-win', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_web_server:5'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Web Server 5', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_web_server:5'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Web Server 5', 'packageName': 'jws5-mod_cluster', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_web_server:6'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Web Server 6', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:lightspeed_for_runtimes:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Lightspeed for Runtimes Operator', 'packageName': 'rh-lightspeed-runtimes/runtimes-agent-init-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:offline_knowledge_portal:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Offline Knowledge Portal', 'packageName': 'offline-knowledge-portal/rhokp-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-trustyai-service-rhel8', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-trustyai-service-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'packageName': 'devspaces/openvsx-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'packageName': 'devspaces/pluginregistry-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_bpms_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Process Automation 7', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'candlepin', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'openvox-server', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'puppetserver', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'satellite:el8/candlepin', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'packageName': 'satellite:el8/puppetserver', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:red_hat_single_sign_on:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Single Sign-On 7', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_streams:2'], 'vendor': 'Red Hat', 'product': 'streams for Apache Kafka 2', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_streams:3'], 'vendor': 'Red Hat', 'product': 'streams for Apache Kafka 3', 'packageName': 'httpclient', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:ocp_tools'], 'vendor': 'Red Hat', 'product': 'OpenShift Developer Tools and Services', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:cryostat:4'], 'vendor': 'Red Hat', 'product': 'Cryostat 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:migration_toolkit_applications:8'], 'vendor': 'Red Hat', 'product': 'Migration Toolkit for Applications 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:serverless:1'], 'vendor': 'Red Hat', 'product': 'OpenShift Serverless', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_broker:7'], 'vendor': 'Red Hat', 'product': 'Red Hat AMQ Broker 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_clients:2023'], 'vendor': 'Red Hat', 'product': 'Red Hat AMQ Clients', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:apache_camel_hawtio:4'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apache Camel - HawtIO 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:camel_quarkus:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apache Camel 4 for Quarkus 3', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:camel_spring_boot:4'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apache Camel for Spring Boot 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:service_registry:2'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apicurio Registry 2', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:apicurio_registry:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apicurio Registry 3', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:debezium:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Debezium 3', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:optaplanner:::el6'], 'vendor': 'Red Hat', 'product': 'Red Hat build of OptaPlanner 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:quarkus:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Quarkus', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:certificate_system:10'], 'vendor': 'Red Hat', 'product': 'Red Hat Certificate System 10', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_data_grid:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Data Grid 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 10', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 9', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_fuse:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Fuse 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_core_services:1'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Core Services', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_web_server:5'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Web Server 5', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_web_server:6'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Web Server 6', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:lightspeed_for_runtimes:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Lightspeed for Runtimes Operator', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:offline_knowledge_portal:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Offline Knowledge Portal', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_bpms_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Process Automation 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:red_hat_single_sign_on:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Single Sign-On 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_streams:2'], 'vendor': 'Red Hat', 'product': 'streams for Apache Kafka 2', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_streams:3'], 'vendor': 'Red Hat', 'product': 'streams for Apache Kafka 3', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Added CWE CWE-325 Added Reference https://access.redhat.com/security/cve/CVE-2026-40542 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2460518 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache HttpClient', 'versions': [{'status': 'affected', 'version': '5.6', 'lessThan': '5.6.1', 'versionType': 'semver'}], 'packageName': 'org.apache.httpcomponents.client5:httpclient5', 'collectionURL': 'https://repo.maven.apache.org/maven2', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-40542', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-22T14:14:52.319783Z'} -
Initial Analysis by [email protected]
May. 01, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:* Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/22/5 Types: Mailing List, Third Party Advisory Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97 Types: Mailing List, Vendor Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 22, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/22/5 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 22, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L -
New CVE Received by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-304 Added Reference https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.