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Vulnerability record · CVE-2026-104039 · published 6 October 2026

CVE-2026-104039: Fedoraproject sssd vulnerability

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.

5.5 CVSS 3.1 Medium EPSS 0.13% · top 97.2% CWE-825 · CWE-825
5.5CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References, 1 tagged exploit
5 Nov 2026Last modified by NVD

Description

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-104039 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2478956 ExploitIssue TrackingMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-104039), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.