{"id":"CVE-2026-90462","aliases":["CLSA-2026-1791809045","CLSA-2026-1792405584","DEBIAN-CVE-2026-90462","EUVD-2026-84537","GHSA-58vh-w7mf-682f","SUSE-SU-2026:5079-1","UBUNTU-CVE-2026-90462"],"status":"published","title":"Sssd: sssd: fail-open in ldap ppolicy access check allows continued authorization","description":"A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup returns zero results. This can incorrectly return success and cache an allow decision, permitting continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account context could exploit this to maintain access to information and potentially make limited modifications to resources that should no longer be available.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0018,"percentile":0.07688,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-280"],"published":"2026-09-22T15:50:00Z","modified":"2026-11-07T11:00:10Z","affected":[{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libipa_hbac","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libipa_hbac-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_autofs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_certmap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_certmap-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_idmap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_idmap-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_nss_idmap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_nss_idmap-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_simpleifp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_simpleifp-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"libsss_sudo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"python3-libipa_hbac","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"python3-libsss_nss_idmap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"python3-sss","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"python3-sss-murmur","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"python3-sssdconfig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"sssd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"sssd-ad","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"sssd-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"sssd-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"sssd-common-pac","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":"sssd-dbus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.6-4.el9_6.2.tuxcare.els8"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:AlmaLinux:9.6","package":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When configured with the LDAP access provider and `ldap_access_order` including `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup returns zero results. This can incorrectly return success and cache an allow decision, permitting continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account context could exploit this to maintain access to information and potentially make limited modifications to resources that should no longer be available.","status":"published","published":"2026-09-22T15:50:00.863Z","modified":"2026-11-06T01:44:04.856Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-280"],"updated_at":"2026-11-06T02:55:55.947181Z"}],"euvd":[{"id":"EUVD-2026-84537","description":"A flaw was found in SSSD. 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This can incorrectly return success and cache an allow decision, permitting continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account context could exploit this to maintain access to information and potentially make limited modifications to resources that should no longer be available.","status":"published","published":"2026-09-22T16:18:08.137Z","modified":"2026-11-07T11:00:10.760312749Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-07T11:15:14.449016Z"},{"id":"UBUNTU-CVE-2026-90462","description":"A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup returns zero results. This can incorrectly return success and cache an allow decision, permitting continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account context could exploit this to maintain access to information and potentially make limited modifications to resources that should no longer be available.","status":"published","published":"2026-09-22T16:18:00Z","modified":"2026-10-17T13:01:16.719074541Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:57:35.676249Z"},{"id":"CLSA-2026-1791809045","title":"sssd: Fix of 2 CVEs","description":"- CVE-2026-90462: deny access in sdap_access_ppolicy_step_done() when the\n  LDAP ppolicy user search returns zero entries, instead of returning success\n  and caching an allow decision\n- CVE-2026-90996: reject an empty request body in the NSS responder request\n  parsers before body[blen - 1] is read","status":"published","published":"2026-10-12T12:44:15Z","modified":"2026-10-26T09:31:36.619492357Z","updated_at":"2026-11-02T15:43:50.599064Z"},{"id":"CLSA-2026-1792405584","title":"sssd: Fix of 3 CVEs","description":"- CVE-2026-90462: deny access and cache the deny decision when the LDAP\n  ppolicy access check lookup returns zero results, fixing a fail-open that\n  let deleted or deprovisioned users keep passing access checks\n- CVE-2026-90996: reject header-only requests with an empty body in the NSS\n  responder parsers, preventing a size_t underflow on body[blen - 1] access\n  that could crash the responder\n- CVE-2026-104045: skip reparenting the autofs enumeration context to the\n  maps table when its key was orphaned during the async request, fixing a\n  memory leak in the autofs responder","status":"published","published":"2026-10-20T17:33:31Z","modified":"2026-10-26T09:43:29.134788559Z","updated_at":"2026-11-02T15:43:54.119956Z"},{"id":"SUSE-SU-2026:5079-1","title":"Security update for sssd","description":"This update for sssd fixes the following issues:\n\n- CVE-2026-12610: cancelled or completed PAM request while the asynchronous child process is still running can lead to a\n  use-after-free (bsc#1269807).\n- CVE-2026-68742: unvalidated address lengths in NSS responder packet parsing can cause a heap out-of-bounds read\n  (bsc#1273922).\n- CVE-2026-68743: oversized length parameters in authentication requests can cause heap out-of-bounds reads\n  (bsc#1273925).\n- CVE-2026-68744: unshrunk packet allocations during group resolution can allow uninitialized heap memory disclosure\n  (bsc#1273924).\n- CVE-2026-90462: Fail-open in LDAP ppolicy access check allows continued authorization (bsc#1282584).\n- CVE-2026-90463: out-of-bounds read in the NSS service request parsers (bsc#1280360).\n- CVE-2026-90994: out-of-bounds read in PAM v1 parser (bsc#1280361).\n- CVE-2026-90995: NULL pointer dereference in PAM responder (bsc#1280362).\n- CVE-2026-90996: zero-length request body underflow in the NSS responder (bsc#1280363).\n- CVE-2026-92821: access control bypass due to premature LDAP access rule evaluation (bsc#1284326).\n- CVE-2026-104029: denial of service due to out-of-bounds read in autofs responder (bsc#1284314).\n- CVE-2026-104031: denial of service via memory exhaustion in autofs responder (bsc#1284316).\n- CVE-2026-104033: access control bypass due to improper LDAP shadow expiration check (bsc#1284318).\n- CVE-2026-104036: denial of service due to out-of-bounds write in NFS idmap plugin (bsc#1284321).\n- CVE-2026-104037: denial of service due to packet length underflow in autofs responder (bsc#1284322).\n- CVE-2026-104038: denial of service via missing SID extension in certificate mapping (bsc#1284323).\n- CVE-2026-104039: denial of service due to stale connection state reuse in PAM GSSAPI responder (bsc#1284324).\n- CVE-2026-104043: Denial of Service via undersized packet parsing in NSS responder (bsc#1284266).\n- CVE-2026-104045: denial of service via race condition in autofs responder (bsc#1284470).\n","status":"published","published":"2026-11-03T08:22:57Z","modified":"2026-11-03T22:45:05.157791012Z","updated_at":"2026-11-03T22:59:30.419462Z"}]}}