# CVE-2026-15722: Memory corruption in Red Hat Directory Server 11.5 E4S for RHEL 8

> Remote unauthenticated attackers can crash the LDAP server via a stack buffer overflow in replica ID parsing, causing denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Jul 2026
- **Updated:** 8 Oct 2026
- **Also known as:** AZL-94362, CLSA-2026-1787755227, DEBIAN-CVE-2026-15722, GHSA-5gg4-m865-6qwr, UBUNTU-CVE-2026-15722

## What is CVE-2026-15722?

CVE-2026-15722 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to denial of service.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2026-15722?

It affects 3 products.


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

## How do I fix CVE-2026-15722?

Apply the vendor's patch.

## Is CVE-2026-15722 being exploited?

There is no known exploitation of CVE-2026-15722 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-2026-9064](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)
- [CVE-2024-6237](https://insights.sbomify.com/CVE-2024-6237/): 389-ds-base: unauthenticated user can trigger a dos by sending a specific extended search request (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15722 and fix it if it is affected.

What it is: CVE-2026-15722 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-15722 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-2026-15722/ (Markdown: https://insights.sbomify.com/CVE-2026-15722/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15722
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15722
- OSV: https://osv.dev/vulnerability/CVE-2026-15722

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15722/
Summaries are generated and may contain mistakes; the official description above is the record.