Resource exhaustion in Red Hat Directory Server 11
CVE-2026-11790
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 can cause excessive CPU consumption during authentication, resulting in denial of service.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (19.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Red Hat Directory Server 11
- Red Hat Directory Server 12
- Red Hat Directory Server 13
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat 389 Directory Server — versions 1.3.6.0
- Red Hat Directory Server — versions 11.0, 12.0, 13.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-11790 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- redhat.atlassian.net/browse/PSIRTSUPT-7600 (Permissions Required)
Frequently asked questions
- What is CVE-2026-11790?
- CVE-2026-11790 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Uncontrolled Resource Consumption. CVSS score: 4.9/10. Published 2026-06-09.
- How severe is CVE-2026-11790?
- Medium severity. CVSS v3 base score is 4.9 out of 10.