A flaw was found in SSSD's conversion of X.509 certificate RSA public keys to SSH keys. Missing size checks before copying RSA components into fixed-size stack buffers can cause a stack buffer overflow. An attacker able to supply a certificate with oversized RSA components that passes the configured certificate checks can cause denial of service and corrupt SSH responder memory.

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Fixes

Solution

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Workaround

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.

History

Fri, 13 Nov 2026 06:15:00 +0000

Type Values Removed Values Added
First Time appeared Red Hat
Red Hat enterprise Linux
Redhat openshift Container Platform
Sssd
Sssd sssd
Vendors & Products Red Hat
Red Hat enterprise Linux
Redhat openshift Container Platform
Sssd
Sssd sssd

Fri, 13 Nov 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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

Type Values Removed Values Added
Description A flaw was found in SSSD's conversion of X.509 certificate RSA public keys to SSH keys. Missing size checks before copying RSA components into fixed-size stack buffers can cause a stack buffer overflow. An attacker able to supply a certificate with oversized RSA components that passes the configured certificate checks can cause denial of service and corrupt SSH responder memory.
Title Sssd: sssd: stack buffer overflow during rsa certificate-to-ssh key conversion
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Redhat rhel Els
Weaknesses CWE-121
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': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-12T19:28:54.851Z

Reserved: 2026-11-12T14:41:14.737Z

Link: CVE-2026-127099

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-12T18:17:40.227

Modified: 2026-11-12T20:18:34.627

Link: CVE-2026-127099

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-11-12T16:36:54Z

Links: CVE-2026-127099 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-13T06:00:08Z

Weaknesses