CVE-2026-11790 389-ds-base: 389-ds-base: pbkdf2 password storage plugin unbounded iteration count denial of service

What is CVE-2026-11790?

CVE-2026-11790 is a medium-severity denial of service 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 PBKDF2-SHA256 password storage plugin does not enforce an upper bound on the iteration count extracted from stored password hashes. A privileged attacker who can modify a user's password hash can cause excessive CPU consumption during authentication, resulting in denial of service.

Weakness: CWE-400

Which versions are affected by CVE-2026-11790?

It affects 3 products.

Products include Redhat 389 Directory Server, Redhat Directory Server, Redhat Enterprise Linux.

How do I fix CVE-2026-11790?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-11790 being exploited?

There is no known exploitation of CVE-2026-11790 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 High 7.5
• CVE-2026-15722 Memory corruption in Red Hat Directory Server 11.5 E4S for RHEL 8 High 7.5
• CVE-2026-9064 Denial of service in Red Hat Directory Server 11.5 E4S for RHEL 8 High 7.5
• CVE-2010-2222 Null dereference in Red Hat Directory Server High 7.5
• CVE-2026-11611 389-ds-base: 389-ds-base: content sync plugin unbounded queue growth and race conditions Medium 6.5

All Redhat Enterprise Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-11790, GHSA-5cpf-527w-96rp, UBUNTU-CVE-2026-11790.