CVE-2026-44592

CRITICAL

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 9.4
EPSS 0.0016
EPSS Percentile 5.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-306 CWE-345 CWE-862
Status published
Products (1)
wavelens/gradient 1.1.0
Published May 14, 2026
Tracked Since May 15, 2026