Vulnerability · Published May 14, 2026 · Assigned by GitHub_M

CVE-2026-44592Gradient: Unauthenticated worker on /proto → arbitrary NAR write / cache poisoning

Critical 9.4

In plain English

A critical-severity missing authentication in gradient from wavelens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)9.4Critical

Exploit odds (30 days)0.2%top 95.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
wavelens	gradient	1.1.0

Weakness: CWE-306, CWE-345, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

References

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