CVE-2026-11789 — MEDIUM (4.9)

Vulnerability 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.

CVSS Score

4.9

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Redhat	Directory Server	11.0
Redhat	389 Directory Server	-
Redhat	Enterprise Linux	7.0

Related Weaknesses (CWE)

CWE-191

References

https://access.redhat.com/security/cve/CVE-2026-11789Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2485422Issue TrackingVendor Advisory

FAQ

What is CVE-2026-11789?

CVE-2026-11789 is a vulnerability with a CVSS score of 4.9 (MEDIUM). 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 ...

How severe is CVE-2026-11789?

CVE-2026-11789 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-11789?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Directory Server, Redhat 389 Directory Server, Redhat Enterprise Linux.