Missing Authentication for Critical Function in nix - #VU163013
Published: November 9, 2026
Vulnerability identifier: #VU163013
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-306
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged local attacker to inject malicious code into content-addressed builds and gain elevated access.
The vulnerability exists due to missing signature verification in the Nix daemon when registering build realisations through registerDrvOutput with the experimental ca-derivations feature enabled. A low-privileged local attacker can use daemon socket access and knowledge of a future build's derivation to register invalid output mappings that poison that build.
Affected software
nix
Remediation
Install security update from vendor's website.
nix - update to 2.35.0