CVE-2026-90996 Sssd: sssd: denial of service in nss responder via crafted zero-length requests
A local unprivileged user can cause a denial of service in the SSSD NSS responder by sending crafted zero-length requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90996?
CVE-2026-90996 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 14 Sep 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. A local unprivileged user could send a specially crafted request with a zero-length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the availability of the system responder.
Weakness: CWE-191
Which versions are affected by CVE-2026-90996?
It affects 3 products.
Products include Fedoraproject Sssd, Redhat Enterprise Linux, Redhat Openshift Container Platform.
How do I fix CVE-2026-90996?
Apply the vendor's patch.
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-2026-90996 being exploited?
There is no known exploitation of CVE-2026-90996 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
Sources
Also known as DEBIAN-CVE-2026-90996, GHSA-xg93-wm7f-rmcx, UBUNTU-CVE-2026-90996.