A flaw was found in SSSD's PAM responder. A local attacker can send an authentication request without first negotiating the client protocol version. The responder dereferences a NULL protocol-version pointer and crashes, disrupting SSSD-backed authentication. Repeated crafted requests can sustain the denial of service.

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History

Thu, 12 Nov 2026 18:00:00 +0000

Type Values Removed Values Added
Description A flaw was found in SSSD's PAM responder. A local attacker can send an authentication request without first negotiating the client protocol version. The responder dereferences a NULL protocol-version pointer and crashes, disrupting SSSD-backed authentication. Repeated crafted requests can sustain the denial of service.
Title Sssd: sssd: null pointer dereference in pam responder when protocol version negotiation is skipped
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Redhat rhel Els
Weaknesses CWE-476
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:openshift:4
cpe:/a:redhat:openshift:5
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
Redhat rhel Els
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-12T17:55:02.216Z

Reserved: 2026-11-12T14:41:14.738Z

Link: CVE-2026-127101

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-12T18:17:41.110

Modified: 2026-11-12T18:17:41.477

Link: CVE-2026-127101

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses