---
id: CVE-2026-104043
title: 'Sssd: sssd: denial of service via undersized packet parsing in nss responder'
summary: >-
  A flaw was found in SSSD. A local attacker with access to the Name Service
  Switch (NSS) responder UNIX socket can trigger an integer underflow by sending
  a specially crafted request with an undersized packet header. This issue
  causes an …
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-125
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: '2026-10-06T01:02:13.343Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-104043'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-104043'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2478852'
    label: RHBZ#2478852
tags:
  - cve.org
ingestedAt: '2026-10-06T01:38:44.802Z'
---

## Overview

A flaw was found in SSSD. A local attacker with access to the Name Service Switch (NSS) responder UNIX socket can trigger an integer underflow by sending a specially crafted request with an undersized packet header. This issue causes an out-of-bounds memory read during packet parsing, crashing the responder process and resulting in a Denial of Service (DoS).

## 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.

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.