CVE-2026-39866: Lawnchair vulnerable to Command Injection via unquoted workflow dispatch input in release_update.yml

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-21 · updated 2026-10-26
Weakness: CWE-77

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.

Affected products

LawnchairLauncher lawnchair: through 15.0.0

References

https://github.com/LawnchairLauncher/lawnchair/commit/fcba413f55dd47f8a3921445252849126c6266b2
https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427
https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427

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