---
id: CVE-2026-68743
title: >-
  Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length
  in protocol v1
summary: >-
  A flaw was found in SSSD. The extract_authtok_v1() function in the PAM
  responder does not validate the auth_token_length field against the remaining
  buffer size before processing. A local attacker can exploit this via a crafted
  protocol …
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: '2026-08-04T19:03:32.411357Z'
published: '2026-08-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:51:35.772Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68743'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-68743'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2509760'
    label: RHBZ#2509760
tags:
  - cve.org
epss: 0.00133
epssPercentile: 0.02887
ingestedAt: '2026-11-05T23:41:31.938Z'
---

## Overview

A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM 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.