CVE-2026-104043 Sssd: sssd: denial of service via undersized packet parsing in nss responder
A local attacker can crash the SSSD NSS responder via an integer underflow in packet parsing, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104043?
CVE-2026-104043 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 6 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. A local attacker with access to the Name Service Switch (NSS) responder UNIX socket can trigger an integer underflow by sending a specially crafted request with an undersized packet header. This issue causes an out-of-bounds memory read during packet parsing, crashing the responder process and resulting in a Denial of Service (DoS).
Weakness: CWE-125
Which versions are affected by CVE-2026-104043?
How do I fix CVE-2026-104043?
No fix has been published for CVE-2026-104043 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-104043 being exploited?
There is no known exploitation of CVE-2026-104043 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-104043, GHSA-wxvg-2hw7-58q4, UBUNTU-CVE-2026-104043.