CVE-2026-44592CWE-306CWE-345CWE-862

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

Critical · published May 14, 2026

CVSS v3.1
9.4
EPSS
0%
Percentile
11.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.4 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00216 · 11.4th percentile
Weaknesses
CWE-306 · Missing Authentication for Critical Function; CWE-345 · Insufficient Verification of Data Authenticity; CWE-862 · Missing Authorization
Published
2026-05-14T18:39Z
EPSS history
Timeline
  • 14 MAY 18:39Z
    Gradient: Unauthenticated worker on /proto → arbitrary NAR write / cache poisoning
    cvelistv5