--- id: CVE-2026-18922 title: A flaw was found in 389 Directory Server summary: >- A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a Cyrus SASL auxiliary property from a prior failed bind attempt can be installed on a connection following a subsequent, unrelated s… severity: critical cvss: 9.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-287 vendor: Red Hat product: 'redhat-ds:11' affected: - 'redhat-ds:11 (all versions)' - 'redhat-ds:11 (all versions)' - 'redhat-ds:12 (all versions)' - 'redhat-ds:12 (all versions)' - 389-ds-base (all versions) - 389-ds-base (all versions) - 389-ds-base (all versions) - 389-ds-base (all versions) - '389-ds:1.4 (all versions)' - '389-ds:1.4 (all versions)' - '389-ds:1.4 (all versions)' - '389-ds:1.4 (all versions)' - '389-ds:1.4 (all versions)' - '389-ds:1.4 (all versions)' - '389-ds:1.4 (all versions)' - 389-ds-base (all versions) - 389-ds-base (all versions) - 389-ds-base (all versions) - 389-ds-base (all versions) - 389-ds-base (all versions) - 389-ds-base patched: - enterprise_linux_server_extension_v_6_els_extension - enterprise_linux_server_optional_extension_v_6_els_extension - enterprise_linux_server_v_7_els - enterprise_linux_server_optional_v_7_els - directory_server_11_9_for_rhel 8 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_aus_v_8_6 - enterprise_linux_appstream_eus_extension_v_8_6 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - directory_server_11_7_e4s_for_rhel 8 - directory_server_12_2_e4s_for_rhel 9 - directory_server_12_4_e4s_for_rhel 9 - enterprise_linux_codeready_linux_builder_eus_v_10_0 - enterprise_linux_codeready_linux_builder_v_10 - codeready_linux_builder_eus_v_9_6 - enterprise_linux_codeready_linux_builder_v_9 published: '2026-09-07' updated: '2026-09-08' sourceUpdated: '2026-09-08T19:08:15.590' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18922' references: - url: 'https://access.redhat.com/errata/RHSA-2026:64771' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64776' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64778' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64779' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64780' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64781' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64783' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64784' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64785' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64789' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64790' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64791' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64792' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64793' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64804' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64811' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-18922' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2511388' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18922.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-18922' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18922' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.0056 epssPercentile: 0.45458 ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-09-08T13:04:02.842508Z' ingestedAt: '2026-09-08T15:33:26.978Z' --- ## Overview A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a Cyrus SASL auxiliary property from a prior failed bind attempt can be installed on a connection following a subsequent, unrelated successful bind, regardless of which SASL mechanism completes that second bind. An attacker can send a SASL PLAIN bind as cn=Directory Manager with an incorrect password, then complete a SASL ANONYMOUS bind on the same connection, causing the server to grant Directory Manager authority without any valid credentials. A variant using a valid low-privileged account's own successful bind instead of an anonymous one is also possible. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:64811** · Red Hat · fixed in: Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64811) - **RHSA-2026:64771** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64771) - **RHSA-2026:64793** · Red Hat · fixed in: Red Hat Directory Server 11.9 for RHEL 8 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64793) - **RHSA-2026:64804** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64804) - **RHSA-2026:64785** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64785) - **RHSA-2026:64791** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64791) - **RHSA-2026:64789** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64789) - **RHSA-2026:64790** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64790) - **RHSA-2026:64776** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64776) - **RHSA-2026:64778** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64778) - **RHSA-2026:64781** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64781) - **Red Hat VEX** · Critical · affected: Red Hat Directory Server 12 · no fix planned: Red Hat Directory Server 12 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18922.json)