CVE-2026-104039
mediumA flaw was found in SSSD.
Vendor / product: Fedoraproject — sssd
A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. When handling Generic Security Services Application Programming Interface (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and unexpectedly terminate.
CVSS
5.5
5.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-10-06 02:17
Modified: 2026-11-03 21:16
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 21:22 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
fedoraproject / sssd 2.12.0
redhat / openshift_container_platform 4.0
redhat / enterprise_linux 7.0, 8.0, 9.0, 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-104039
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2478956
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2478956
References
- https://access.redhat.com/security/cve/CVE-2026-104039 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2478956 secalert@redhat.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 21:22 UTC · record ↗