---
id: CVE-2026-104038
title: A flaw was found in sssd
summary: >-
  A flaw was found in sssd. A remote attacker can cause a denial of service
  (DoS) by submitting a certificate that lacks an expected Security Identifier
  (SID) extension. In deployments configured with SID-based certificate mapping
  rules, t…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
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: '2026-10-06T01:16:34.853'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104038'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-104038'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2478980'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T00:37:36.246Z'
---

## Overview

A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with SID-based certificate mapping rules, the service fails to verify the presence of the extension before processing it, causing the process to crash during authentication or lookup operations.

## Remediation

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