# 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.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Jun 2026
- **Updated:** 30 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-11789, GHSA-jjqx-m459-2x33, UBUNTU-CVE-2026-11789

## 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 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2026-11789?

It affects 3 products.


Products: 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](https://insights.sbomify.com/CVE-2026-11770/): 389-ds-base: 389-ds-base: pre-auth ldap filter injection in cleanallruv status check (high 7.5)
- [CVE-2026-15722](https://insights.sbomify.com/CVE-2026-15722/): Memory corruption in Red Hat Directory Server 11.5 E4S for RHEL 8 (high 7.5)
- [CVE-2026-9064](https://insights.sbomify.com/CVE-2026-9064/): Denial of service in Red Hat Directory Server 11.5 E4S for RHEL 8 (high 7.5)
- [CVE-2010-2222](https://insights.sbomify.com/CVE-2010-2222/): Null dereference in Red Hat Directory Server (high 7.5)
- [CVE-2026-11611](https://insights.sbomify.com/CVE-2026-11611/): 389-ds-base: 389-ds-base: content sync plugin unbounded queue growth and race conditions (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11789 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-11789 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-11789/ (Markdown: https://insights.sbomify.com/CVE-2026-11789/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11789
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11789
- OSV: https://osv.dev/vulnerability/CVE-2026-11789

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11789/
Summaries are generated and may contain mistakes; the official description above is the record.