CVE-2026-11789 389-ds-base: 389-ds-base: smd5 password storage plugin salt length integer underflow crash
An attacker can crash the LDAP server by sending a crafted short password hash, causing an integer underflow in the SMD5 plugin.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-11789?
CVE-2026-11789 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 9 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-191
Which versions are affected by CVE-2026-11789?
It affects 3 products.
Products include Redhat 389 Directory Server, Redhat Directory Server, Redhat Enterprise Linux.
How do I fix CVE-2026-11789?
Apply the vendor's patch.
Is CVE-2026-11789 being exploited?
There is no known exploitation of CVE-2026-11789 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2026-11770 389-ds-base: 389-ds-base: pre-auth ldap filter injection in cleanallruv status check
- CVE-2026-15722 Memory corruption in Red Hat Directory Server 11.5 E4S for RHEL 8
- CVE-2026-9064 Denial of service in Red Hat Directory Server 11.5 E4S for RHEL 8
- CVE-2010-2222 Null dereference in Red Hat Directory Server
- CVE-2026-11611 389-ds-base: 389-ds-base: content sync plugin unbounded queue growth and race conditions
Sources
Also known as DEBIAN-CVE-2026-11789, GHSA-jjqx-m459-2x33, UBUNTU-CVE-2026-11789.