CVE-2026-127099

Sssd: sssd: stack buffer overflow during rsa certificate-to-ssh key conversion

Published Nov 12, 2026 CVSS 3.1 · 5.9 Medium EPSS n/a KEV · Not listed
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.

Remediation

Vendor 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.

Tracking

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Advisories

No advisories available
History
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
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 12, 2026, 7:28 PM
Reserved
Nov 12, 2026, 2:41 PM
Status
Awaiting Analysis
Published
Nov 12, 2026, 6:17 PM
Modified
Nov 12, 2026, 8:18 PM
Severity
Moderate
Public date
Nov 12, 2026, 4:36 PM