CVE-2026-40542 (GCVE-0-2026-40542)

Vulnerability from cvelistv5 – Published: 2026-04-22 07:07 – Updated: 2026-07-15 01:00
VLAI
Title
Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification
Summary
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.
Severity
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 14:14 UTC
CWE
  • CWE-304 - Missing Critical Step in Authentication
  • CWE-325 - Missing Cryptographic Step
Assigner
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache HttpClient Affected: 5.6 , < 5.6.1 (semver)
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Migration Toolkit for Applications 8     cpe:/a:redhat:migration_toolkit_applications:8
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Red Hat OpenShift Developer Tools and Services     cpe:/a:redhat:ocp_tools
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Red Hat OpenShift Serverless     cpe:/a:redhat:serverless:1
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
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Red Hat Red Hat AMQ Clients     cpe:/a:redhat:amq_clients:2023
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Red Hat Red Hat build of Apache Camel 4 for Quarkus 3     cpe:/a:redhat:camel_quarkus:3
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Red Hat Red Hat build of Apache Camel for Spring Boot 4     cpe:/a:redhat:camel_spring_boot:4
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Red Hat Red Hat build of Apache Camel - HawtIO 4     cpe:/a:redhat:apache_camel_hawtio:4
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Red Hat Red Hat build of Apicurio Registry 2     cpe:/a:redhat:service_registry:2
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Red Hat Red Hat build of Apicurio Registry 3     cpe:/a:redhat:apicurio_registry:3
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Red Hat Red Hat build of Debezium 3     cpe:/a:redhat:debezium:3
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Red Hat Red Hat build of OptaPlanner 8     cpe:/a:redhat:optaplanner:::el6
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Red Hat Red Hat build of Quarkus     cpe:/a:redhat:quarkus:3
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Red Hat Red Hat Certificate System 10     cpe:/a:redhat:certificate_system:10
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Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat JBoss Core Services     cpe:/a:redhat:jboss_core_services:1
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat JBoss Web Server 5     cpe:/a:redhat:jboss_enterprise_web_server:5
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Red Hat Red Hat JBoss Web Server 6     cpe:/a:redhat:jboss_enterprise_web_server:6
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Red Hat Red Hat Lightspeed for Runtimes Operator     cpe:/a:redhat:lightspeed_for_runtimes:1
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Red Hat Red Hat Offline Knowledge Portal     cpe:/a:redhat:offline_knowledge_portal:1
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
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Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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Red Hat streams for Apache Kafka 2     cpe:/a:redhat:amq_streams:2
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Red Hat streams for Apache Kafka 3     cpe:/a:redhat:amq_streams:3
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Credits
Rasmus Moorats
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      "product_status:known_affected": "2",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "httpclient: Apache HttpClient: Authentication bypass due to missing mutual authentication verification",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-01T03:27:47Z",
      "cve": "CVE-2026-40542",
      "id": "CVE-2026-40542",
      "initial_release_date": "2026-04-23T01:23:42Z",
      "product_status:known_not_affected": "42",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-40542",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-40542.json",
      "version": "4"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/04/22/5\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-04-22T16:23:59.296Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-40542\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-22T14:14:52.319783Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-22T14:14:06.309Z\"}}], \"cna\": {\"title\": \"Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Rasmus Moorats\"}], \"metrics\": [{\"other\": {\"type\": \"Textual description of severity\", \"content\": {\"text\": \"Important\"}}}], \"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\"}], \"references\": [{\"url\": \"https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003ccode\u003eMissing 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.\u003c/code\u003e\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-304\", \"description\": \"CWE-304: Missing Critical Step in Authentication\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2026-04-22T07:07:21.344Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-40542\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-22T16:23:59.296Z\", \"dateReserved\": \"2026-04-14T09:11:14.268Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2026-04-22T07:07:21.344Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.