---
id: CVE-2026-104041
title: 'Sssd: sssd: denial of service via unbounded negative cache growth'
summary: >-
  A flaw was found in SSSD. An unprivileged local user can repeatedly request
  lookups for nonexistent entries through the Name Service Switch (NSS)
  responder. Because the negative cache does not limit the total number of
  stored entries and…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-770
vendor: Red Hat
product: sssd
affected:
  - sssd (all versions)
  - sssd
  - sssd (all versions)
  - sssd (all versions)
  - sssd (all versions)
  - openshift/ose-rhel-coreos-8 (all versions)
  - openshift/ose-rhel-coreos-9 (all versions)
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T01:00:49.767Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-104041'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-104041'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2478864'
    label: RHBZ#2478864
tags:
  - cve.org
ingestedAt: '2026-10-06T01:38:44.804Z'
---

## Overview

A flaw was found in SSSD. An unprivileged local user can repeatedly request lookups for nonexistent entries through the Name Service Switch (NSS) responder. Because the negative cache does not limit the total number of stored entries and only removes expired records when an existing key is rechecked, the cache can grow without bound. This behavior can lead to memory exhaustion, resulting in a Denial of Service (DoS) as the responder becomes unresponsive or terminates.

## Affected

- `sssd (all versions)`
- `sssd`
- `sssd (all versions)`
- `sssd (all versions)`
- `sssd (all versions)`
- `openshift/ose-rhel-coreos-8 (all versions)`
- `openshift/ose-rhel-coreos-9 (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.