CVE-2026-40227 Denial of service in systemd

What is CVE-2026-40227?

CVE-2026-40227 is a medium-severity denial of service vulnerability in Systemd Project Systemd, published on 10 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In systemd 260 before 261, a local unprivileged user can trigger an assert via an IPC API call with an array or map that has a null element.

Weakness: CWE-1025

Which versions are affected by CVE-2026-40227?

It affects 1 product.

Products include Systemd Project Systemd.

How do I fix CVE-2026-40227?

Upgrade to a fixed version.

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-2026-40227 being exploited?

There is no known exploitation of CVE-2026-40227 in the wild and no public exploit code.

Other vulnerabilities in Systemd Project Systemd

• CVE-2015-7510 Memory corruption in n/a Critical 9.8
• CVE-2017-1000082 Privilege escalation in n/a Critical 9.8
• CVE-2016-10156 Privilege escalation in n/a High 7.8
• CVE-2017-9445 Memory corruption in n/a High 7.5
• CVE-2017-9217 Null dereference in n/a High 7.5

All Systemd Project Systemd vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2026-40227, GHSA-848h-497j-8vjq, GHSA-x53v-pxf5-chx6.