---
id: CVE-2026-104036
title: A flaw was found in SSSD's NFS idmap plugin
summary: >-
  A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or
  group names, the plugin detects if an entry exceeds the destination buffer
  size but fails to abort before copying data. A local attacker can trigger this
  vulnera…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-787
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: '2026-10-06T01:16:34.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104036'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-104036'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2479057'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T00:37:36.247Z'
---

## Overview

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

## Remediation

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