{"id":"CVE-2026-11790","title":"389-ds-base: 389-ds-base: pbkdf2 password storage plugin unbounded iteration count denial of service","summary":"A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password storage plugin does not enforce an upper bound on the iteration count extracted from stored password hashes. A privileged attacker who can modify a user's password hash…","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-400"],"vendor":"Red Hat","product":"redhat-ds:11/389-ds-base","affected":["redhat-ds:11/389-ds-base (all versions)","redhat-ds:12/389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base","389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-09T13:28:46.679763Z"},"published":"2026-06-09","updated":"2026-11-05","sourceUpdated":"2026-11-05T16:22:39.112Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-11790","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-11790"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2485421","label":"RHBZ#2485421"}],"tags":["cve.org"],"epss":0.00291,"epssPercentile":0.21815,"ingestedAt":"2026-11-05T22:38:31.344Z","slug":"CVE-2026-11790","body":"## Overview\n\nA flaw was found in 389 Directory Server. The PBKDF2-SHA256 password storage plugin does not enforce an upper bound on the iteration count extracted from stored password hashes. A privileged attacker who can modify a user's password hash can cause excessive CPU consumption during authentication, resulting in denial of service.\n\n## Affected\n\n- `redhat-ds:11/389-ds-base (all versions)`\n- `redhat-ds:12/389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n- `389-ds-base`\n- `389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nDisable nsslapd-allow-hashed-passwords (default: off) to prevent non-DM users from setting pre-hashed passwords. Restrict Directory Manager credentials; limit DM access to management networks and audit DM operations via nsslapd-auditlog. Monitor for suspicious userPassword modifications (unusual hash schemes or large base64 payloads). Monitor for unusually long bind operations to the same account, which may indicate a poisoned PBKDF2 hash.","depth":"sunlit","depthScore":27,"depthScoreParts":{"impact":27,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}