Vulnerability · Published Oct 6, 2026 · Assigned by redhat
CVE-2026-104046Sssd: sssd: denial of service via incomplete identity provider authentication requests
Medium 6.2
In plain English
A medium-severity resource allocation without limits in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Official description
A flaw was found in SSSD (System Security Services Daemon). When Identity Provider (IdP) authentication is enabled, pre-authentication requests retain state in memory without being cleared or timed out. A local attacker can repeatedly initiate authentication flows without completing them, causing unbounded memory consumption. This memory exhaustion can lead to a Denial of Service (DoS) by degrading or terminating SSSD authentication services.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | sssd | no fix listed | DEBIAN-CVE-2026-104046 |
| Debian:13 | sssd | no fix listed | DEBIAN-CVE-2026-104046 |
| Ubuntu:22.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-104046 |
| Ubuntu:24.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-104046 |
| Ubuntu:26.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-104046 |
| Ubuntu:26.10 | sssd | no fix listed | UBUNTU-CVE-2026-104046 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 5 | see references |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-104046 vdb-entry, x_refsource_REDHAT
- RHBZ#2478662 issue-tracking, x_refsource_REDHAT