# CVE-2026-104035: Sssd: sssd: denial of service via memory exhaustion in kcm responder

> A local user can cause a denial of service in SSSD by exhausting memory through repeated credential operations in the KCM responder.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-104035, GHSA-mfvc-j8xf-5w4g, UBUNTU-CVE-2026-104035

## What is CVE-2026-104035?

CVE-2026-104035 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in SSSD. An issue in the Kerberos Credential Manager (KCM) responder allows a local user to cause a Denial of Service (DoS) by maintaining a persistent connection and repeatedly storing and destroying credentials. Because the service fails to release cached objects from memory when credentials are removed, memory consumption grows continuously, ultimately exhausting available memory and rendering the service unresponsive.

Weakness: CWE-772 (Missing Release of Resource after Effective Lifetime)

## Which versions are affected by CVE-2026-104035?


## How do I fix CVE-2026-104035?

No fix has been published for CVE-2026-104035 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104035 being exploited?

There is no known exploitation of CVE-2026-104035 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104035 and fix it if it is affected.

What it is: CVE-2026-104035 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-104035 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2026-104035/ (Markdown: https://insights.sbomify.com/CVE-2026-104035/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104035
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104035
- OSV: https://osv.dev/vulnerability/CVE-2026-104035

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104035/
Summaries are generated and may contain mistakes; the official description above is the record.