{"id":"CVE-2026-40542","summary":"Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification","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.","aliases":["GHSA-v468-qcjx-r72w"],"modified":"2026-07-16T03:30:49.968644297Z","published":"2026-04-22T07:07:21.344Z","related":["CGA-976w-g8c9-jwf5"],"database_specific":{"cna_assigner":"apache","cwe_ids":["CWE-304"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40542.json","unresolved_ranges":[{"extracted_events":[{"introduced":"5.6"},{"fixed":"5.6.1"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/04/22/5"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40542.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-40542"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40542.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/tfmgv86xr0z1y096vs3z0y315t1v3o97"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40542"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460518"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpcomponents-client","events":[{"introduced":"decd193d2b615fa18146a9f8392f201d736faf4b"},{"last_affected":"decd193d2b615fa18146a9f8392f201d736faf4b"}],"database_specific":{"source":"CPE_STRING","cpe":"cpe:2.3:a:apache:httpclient:5.6:-:*:*:*:*:*:*","extracted_events":[{"introduced":"5.6-NA"},{"last_affected":"5.6-NA"}]}}],"versions":["5.6-NA","rel/v5.6","5.6-RC1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40542.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"}]}