CVE-2026-39866: Lawnchair is a free, open-source home app for Android

Q: How do I fix CVE-2026-39866?

lawnchair: upgrade to newer than 15.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-39866 being exploited?

CVE-2026-39866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39866 affect?

CVE-2026-39866 affects lawnchair. Severity is high (CVSS 8.8). 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 fcba413f55dd47f8a392144

Q: How urgent is CVE-2026-39866?

Priority 57/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-39866 is a high-severity flaw (CVSS 8.8) affecting lawnchair. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.3% (top 16%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: lawnchair

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 02:16 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

lawnchair lawnchair UPGRADE

Affected: <= 15.0.0

Fixed in: newer than 15.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lawnchair || rpm -q lawnchair || lawnchair --version

2. UPGRADE to newer than 15.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lawnchair

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lawnchair

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: pvharmo2/gha-lab-360f77d0d4 (1 stars)
GitHub PoC: abhayclasher/CVE-2026-39866 (0 stars)
Write-up: github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39866?

lawnchair: upgrade to newer than 15.0.0. Exact commands for each OS are on this page.

Is CVE-2026-39866 being exploited?

CVE-2026-39866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39866 affect?

CVE-2026-39866 affects lawnchair. Severity is high (CVSS 8.8). 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 fcba413f55dd47f8a392144

How urgent is CVE-2026-39866?

Priority 57/100. High severity; Public exploit reference

Software pages

Android vulnerabilities

References

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