---
id: CVE-2026-90994
title: >-
  A flaw was found in sssd, specifically within the PAM (Pluggable
  Authentication Modules) responder's protocol v1 parser, pam_parse_in_data()
summary: >-
  A flaw was found in sssd, specifically within the PAM (Pluggable
  Authentication Modules) responder's protocol v1 parser, pam_parse_in_data(). A
  local client with access to the PAM responder's UNIX socket can exploit this
  by negotiating p…
severity: medium
cvss: 4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
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: '2026-09-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:42:43.623'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90994'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90994'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2479455'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90994.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90994'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90994'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00171
epssPercentile: 0.05745
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T16:30:04.691959Z'
ingestedAt: '2026-09-14T17:11:16.568Z'
---

## Overview

A flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder's protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder's UNIX socket can exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a local denial of service.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90994.json)