---
id: CVE-2026-68742
title: >-
  Sssd: sssd: nss responder out-of-bounds read via unchecked addrlen in
  gethostbyaddr
summary: >-
  A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the
  NSS responder does not validate the addrlen field against the remaining packet
  body size. A local attacker can exploit this via a crafted GETHOSTBYADDR
  request t…
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)
  - openshift/ose-rhel-coreos-9 (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-03T20:00:15.885432Z'
published: '2026-08-03'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:51:38.914Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68742'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-68742'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2509762'
    label: RHBZ#2509762
tags:
  - cve.org
epss: 0.0013
epssPercentile: 0.02648
ingestedAt: '2026-11-05T23:41:31.939Z'
---

## Overview

A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

## 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)`
- `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.