{"id":"UBUNTU-CVE-2026-40542","details":"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.","modified":"2026-06-30T18:18:03.220186355Z","published":"2026-04-22T08:16:00Z","upstream":["CVE-2026-40542"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-40542"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-40542"},{"type":"REPORT","url":"https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97"}],"affected":[{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.5-2","4.3.2-1","4.3.3-1","4.3.3-1ubuntu0.1","4.3.3-1ubuntu0.1+esm1","4.3.3-1ubuntu0.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libhttpclient-java","binary_version":"4.3.3-1ubuntu0.1+esm2"},{"binary_version":"4.3.3-1ubuntu0.1+esm2","binary_name":"libhttpmime-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.1-1","4.5.1-1","4.5.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhttpclient-java","binary_version":"4.5.1-1ubuntu0.1~esm1"},{"binary_name":"libhttpmime-java","binary_version":"4.5.1-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.3-1","4.5.4-1","4.5.5-1","4.5.5-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhttpclient-java","binary_version":"4.5.5-1ubuntu0.1~esm1"},{"binary_version":"4.5.5-1ubuntu0.1~esm1","binary_name":"libhttpmime-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.9-1","4.5.10-2","4.5.11-1","4.5.11-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhttpclient-java","binary_version":"4.5.11-1ubuntu0.1~esm1"},{"binary_name":"libhttpmime-java","binary_version":"4.5.11-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.13-2","4.5.13-3"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.13-3","binary_name":"libhttpclient-java"},{"binary_name":"libhttpmime-java","binary_version":"4.5.13-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.14-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.14-1","binary_name":"libhttpclient-java"},{"binary_name":"libhttpmime-java","binary_version":"4.5.14-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.14-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.14-1","binary_name":"libhttpclient-java"},{"binary_name":"libhttpmime-java","binary_version":"4.5.14-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40542.json"}},{"package":{"name":"httpcomponents-client","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/httpcomponents-client?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.14-1","4.5.14-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libhttpclient-java","binary_version":"4.5.14-1build1"},{"binary_name":"libhttpmime-java","binary_version":"4.5.14-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-s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