CVE-2026-110453 Missing authorization in Nix
Nix allows unauthorized network connections from build users when unsandboxed on macOS or FreeBSD, bypassing intended isolation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110453?
CVE-2026-110453 is a medium-severity missing authorization vulnerability in NixOS Nix, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Nix before 2.35.3, when unsandboxed on macOS or FreeBSD, incorrectly allows connections made by build users from daemon clients.
Weakness: CWE-863
Which versions are affected by CVE-2026-110453?
How do I fix CVE-2026-110453?
No fix has been published for CVE-2026-110453 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-110453 being exploited?
There is no known exploitation of CVE-2026-110453 in the wild and no public exploit code.
Sources
Also known as GHSA-cm63-px87-wf8p.