What is CVE-2026-104039?

CVE-2026-104039 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under CWE-825. CVSS score: 4.7/10. Published 2026-10-06.

How severe is CVE-2026-104039?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-104039

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.

Published 2026-10-06 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-825

References

access.redhat.com/security/cve/CVE-2026-104039 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-104039?: CVE-2026-104039 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under CWE-825. CVSS score: 4.7/10. Published 2026-10-06.
How severe is CVE-2026-104039?: Medium severity. CVSS v3 base score is 4.7 out of 10.