---
id: "CVE-2026-93336"
kind: "vulnerability"
aliases: ["CVE-2026-93336"]
title: "Canonical Juju: unit agents can read other applications' charm resources and credentials"
severity: "high"
cvss: 7.1
epss: 0.00215
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["canonical", "charms", "infrastructure", "juju", "kubernetes"]
not_affected_if: ["juju-outside-4.0.x"]
published_at: "2026-10-22T18:17:32+00:00"
first_seen_at: "2026-10-23T21:57:31+00:00"
updated_at: "2026-10-25T03:31:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93336", "first_seen_at": "2026-10-23T21:57:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-93336", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# Canonical Juju: unit agents can read other applications' charm resources and credentials

Juju 4.0 through 4.0.15 lacks an authorization check on the unit resources download route. A principal with only a unit agent or login permission can request any unit's resources and read charm resources from any model, including container-registry credentials.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `juju version` and compare against the fixed release in the advisory
- Check whether the controller runs Juju 4.0 through `4.0.15`

## Fix

- Upgrade the Juju controller to a release later than `4.0.15` (the fixed version is unknown from the sources)
- Rotate any container-registry credentials stored as charm resources in affected models

## Timeline

- 2026-10-23T21:57:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-93336
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-93336

## From the sources

Missing authorization in the unit resources download route in Canonical Juju 4.0 through 4.0.15 allows a controller-authenticated principal (a unit agent, or a user with only login permission) to read any application's charm resource in any model,  including container-registry credentials, via a crafted request naming an arbitrary unit.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_