CVE-2026-44592

Gradient: Unauthenticated worker on /proto → arbitrary NAR write / cache poisoning

State: Published
Severity: 9.4 Critical
Published: May 14, 2026
Updated: May 16, 2026
Reserved: May 6, 2026

Description

Gradient is a nix-based continuous integration system. In 1.1.0, when GRADIENT_DISCOVERABLE=true (the default, and the NixOS module default), anyone who can reach /proto can register as a worker without any credentials by sending a fresh, never-registered worker UUID. The resulting session has PeerAuth::Open, i.e. it sees jobs from every organisation, and can immediately NarPush/NarUploaded arbitrary store paths into nar_storage and the cached_path table. This vulnerability is fixed in 1.1.1.

Scores

CVSS	Score	Vector	Source
3.1	9.4 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H	GitHub_M

Weaknesses

CWE-306 Missing Authentication for Critical Function
CWE-345 Insufficient Verification of Data Authenticity
CWE-862 Missing Authorization

Affected Products

Product	Versions
gradientwavelens	1.1.0Affected

References

https://github.com/wavelens/gradient/security/advisories/GHSA-49w6-gf3p-96m2

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