What is CVE-2026-11789?

CVE-2026-11789 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Integer Underflow. CVSS score: 4.9/10. Published 2026-06-09.

How severe is CVE-2026-11789?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Integer overflow in Red Hat Directory Server 11

CVE-2026-11789

A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.

Published 2026-06-09 · last modified 2026-07-23.

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 (18.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.6% 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

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

access.redhat.com/security/cve/CVE-2026-11789 (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-2026-11789?: CVE-2026-11789 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Integer Underflow. CVSS score: 4.9/10. Published 2026-06-09.
How severe is CVE-2026-11789?: Medium severity. CVSS v3 base score is 4.9 out of 10.