389-ds-base: 389-ds-base: smd5 password storage plugin salt length integer underflow crash

Summary

CVE	CVE-2026-11789
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-06-09 14:16:37 UTC
Updated	2026-06-12 18:30:21 UTC
Description	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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003350000 probability, percentile 0.250740000 (date 2026-06-21)

Problem Types: CWE-191 | CWE-191 Integer Underflow (Wrap or Wraparound)

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	6.5	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	4.9	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`
3.1	CNA	CVSS	4.9	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Redhat	389 Directory Server	-	All	All	All
Application	Redhat	Directory Server	11.0	All	All	All
Application	Redhat	Directory Server	12.0	All	All	All
Application	Redhat	Directory Server	13.0	All	All	All
Operating System	Redhat	Enterprise Linux	10.0	All	All	All
Operating System	Redhat	Enterprise Linux	7.0	All	All	All
Operating System	Redhat	Enterprise Linux	8.0	All	All	All
Operating System	Redhat	Enterprise Linux	9.0	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Red Hat	Red Hat Directory Server 11	Not specified	Not specified
CNA	Red Hat	Red Hat Directory Server 12	Not specified	Not specified
CNA	Red Hat	Red Hat Directory Server 13	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 10	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 6	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 7	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	Not specified	Not specified

References

Reference	Source	Link	Tags
bugzilla.redhat.com/show_bug.cgi	[email protected]	bugzilla.redhat.com	Issue Tracking, Vendor Advisory
redhat.atlassian.net/browse/PSIRTSUPT-7600	[email protected]	redhat.atlassian.net	Permissions Required
access.redhat.com/security/cve/CVE-2026-11789	[email protected]	access.redhat.com	Vendor Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
CNA	2026-04-16T00:00:00.000Z	Reported to Red Hat.
CNA	2026-04-16T00:00:00.000Z	Made public.

Workarounds

CNA: Disable 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. Migrate stored passwords from {SMD5} to {PBKDF2_SHA256} to eliminate the vulnerable code path for existing accounts.

There are currently no legacy QID mappings associated with this CVE.