CVE-2026-104030 Sssd: sssd: denial of service via out-of-bounds read during passkey parsing

What is CVE-2026-104030?

CVE-2026-104030 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in sssd. This vulnerability allows a local user to cause a Denial of Service (DoS) by submitting a specially crafted passkey authentication token that lacks null terminators. The authentication service reads past the end of the provided memory buffer, causing the process to crash and disrupting authentication services.

Weakness: CWE-125

Which versions are affected by CVE-2026-104030?

It affects 3 products.

Products include Fedoraproject Sssd, Redhat Enterprise Linux, Redhat Openshift Container Platform.

How do I fix CVE-2026-104030?

No fix has been published for CVE-2026-104030 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-104030 being exploited?

There is no known exploitation of CVE-2026-104030 in the wild and no public exploit code.

Other vulnerabilities in Redhat Enterprise Linux

• CVE-2022-4254 Other in SSSD High 8.8
• CVE-2012-3462 Auth bypass in sssd High 8.8
• CVE-2026-104048 Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation Medium 6.8
• CVE-2015-5292 Denial of service in n/a Medium 6.8
• CVE-2026-12610 Sssd: use-after-free crash in sssd' 'sssd_pam' process Medium 6.4

All Redhat Enterprise Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-104030, GHSA-rwfv-xr9p-g8w4, UBUNTU-CVE-2026-104030.