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Not in CISA KEV
CRITICAL severity

Malicious Package in appx-compilerGHSA-8q2c-2396-hf7j

CRITICAL

GHSA-8q2c-2396-hf7j is a critical-severity (CVSS 9.8) vulnerability in appx-compiler. No vendor fix is recorded yet; mitigation options are listed below.

Published
Updated
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of Sep 30, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.

appx-compilernpm
4downloads / week

Description

All versions of appx-compiler contain malicious code. The package uploads system information to a remote server, downloads a file and executes it.

Recommendation

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer.

The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
📦npmappx-compiler≥ 0.0.0No fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for appx-compiler, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of appx-compiler has shipped for GHSA-8q2c-2396-hf7j yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

All versions of `appx-compiler` contain malicious code. The package uploads system information to a remote server, downloads a file and executes it. ## Recommendation Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
O3 Security · Impact-Aware SCA

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Malicious Package in appx-compiler (Critical 9.8)