CVE-2026-11788 389-ds-base: 389-ds-base: null pointer dereference in deref control plugin ber parser
An unauthenticated remote attacker can crash the LDAP server by triggering a null pointer dereference in the dereference control plugin during memory pressure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-11788?
CVE-2026-11788 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.
Weakness: CWE-476
Which versions are affected by CVE-2026-11788?
It affects 3 products.
Products include Redhat 389 Directory Server, Redhat Directory Server, Redhat Enterprise Linux.
How do I fix CVE-2026-11788?
Apply the vendor's patch.
Is CVE-2026-11788 being exploited?
There is no known exploitation of CVE-2026-11788 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-2026-11788, GHSA-x2wj-4r98-4867, UBUNTU-CVE-2026-11788.