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CRITICAL severity

CVE-2021-21386 — apkleaks

CRITICALFix: dwisiswant0/apkleaks@a966e78

CVE-2021-21386 is a critical-severity (CVSS 9.8) OS Command Injection vulnerability in apkleaks. A fix is available for apkleaks — see the affected versions and patch details below.

Improper Neutralization of Argument Delimiters in a Decompiling Package Process in APKLeaks

Also known asGHSA-8434-v7xw-8m9xPYSEC-2026-281
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.55%1.31%2.07%2.83%1.0%2.3%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-21386 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍apkleaks

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

APKLeaks prior to v2.0.4 allows remote authenticated attackers to execute arbitrary OS commands via package name inside the application manifest.

Impact

An authenticated attacker could include arguments that allow unintended commands or code to be executed, allow sensitive data to be read or modified, or could cause other unintended behavior through malicious package names.

References

  • a966e781499ff6fd4eea66876d7532301b13a382

For more information

If you have any questions or comments about this advisory:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIapkleaksall versions2.0.4pip install --upgrade 'apkleaks==2.0.4'

Affected Products

1 product · 1 configurations
Application
apkleaksapkleaks_project
< 2.0.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update apkleaks to 2.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21386 is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

APKLeaks prior to v2.0.4 allows remote authenticated attackers to execute arbitrary OS commands via package name inside the application manifest. ### Impact An authenticated attacker could include arguments that allow unintended commands or code to be executed, allow sensitive data to be read or modified, or could cause other unintended behavior through malicious package names. ### References - a966e781499ff6fd4eea66876d7532301b13a382 ### For more information If you have any questions or comments about this advisory: * Email me at [[email protected]](mailto:[email protected])
O3 Security · Impact-Aware SCA

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CVE-2021-21386: apkleaks — Fixed in 2.0.4