Vulnerability in ubuntu-advantage-tools (UBUNTU-CVE-2026-9494)

Summary

Vulnerability in ubuntu-advantage-tools (UBUNTU-CVE-2026-9494). Confidential information can be exposed externally. Mitigation: upgrade to 37.2ubuntu~22.04.1 or later.

Original description

The description as published by the source.

An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper using the download-file command. During this process, the secret bearer token is embedded directly in the cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can monitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim's Ubuntu Pro or Expanded Security Maintenance (ESM) repositories.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as UBUNTU-CVE-2026-9494 has been found in ubuntu-advantage-tools.
Confidential information can be exposed externally.
What to do: upgrade ubuntu-advantage-tools to 37.2ubuntu~22.04.1 or later.
If unsure, ask your IT team or search "ubuntu-advantage-tools UBUNTU-CVE-2026-9494" on the vendor's site.

UBUNTU-CVE-2026-9494 (ubuntu-advantage-tools)
Attack vector: local / no user interaction
Patched: 37.2ubuntu~22.04.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in ubuntu-advantage-tools.

📍 Affected scope

Check the vendor advisory for the affected versions of ubuntu-advantage-tools.

🔥 Severity

Severity: ?. Confidential information can be exposed externally.

🔧 How to fix

Update to 37.2ubuntu~22.04.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'ubuntu-advantage-tools' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'ubuntu-advantage-tools' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で ubuntu-advantage-tools を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade ubuntu-advantage-tools to 37.2ubuntu~22.04.1
```
ステージング環境で 37.2ubuntu~22.04.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Ubuntu:22.04:LTS ubuntu-advantage-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"37.2ubuntu~22.04.1"}]}]

Ubuntu:24.04:LTS ubuntu-advantage-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"37.2ubuntu~24.04.1"}]}]

Ubuntu:25.10 ubuntu-advantage-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS ubuntu-advantage-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"37.2ubuntu0.1"}]}]

References

advisory ubuntu.com
report ubuntu.com
report cve.org