by Kastro
Paper/Archive/CVE-2026-44592

CVE-2026-44592

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

EPSS 0.2%CVSS 9.4
critical.is priorityof 100
29
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 4.8.048 × 201.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
gradient1.1.0–CNA

Scores by source

GitHub_M (CNA)9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/wavelens/gradient/security/advisories/GHSA-49w6-gf3p-96m2