How severe is GHSA-2p99-6f47-8x9j?

GHSA-2p99-6f47-8x9j has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-2p99-6f47-8x9j?

GHSA-2p99-6f47-8x9j affects the following packages: asnc (npm). Ecosystems affected: npm.

How do I fix GHSA-2p99-6f47-8x9j?

No patched version of asnc has shipped for GHSA-2p99-6f47-8x9j yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect GHSA-2p99-6f47-8x9j in my npm dependencies?

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

How do I mitigate GHSA-2p99-6f47-8x9j if there is no patch (or I can't update yet)?

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.

Is GHSA-2p99-6f47-8x9j actively exploited in the wild?

No public exploit code has been indexed for GHSA-2p99-6f47-8x9j yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-2p99-6f47-8x9j published, and has it been updated?

GHSA-2p99-6f47-8x9j was published on September 2, 2020 and was last updated on October 1, 2021. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 npm

Not in CISA KEV

CRITICAL severity

Malicious Package in asncGHSA-2p99-6f47-8x9j

CRITICAL

GHSA-2p99-6f47-8x9j is a critical-severity (CVSS 9.8) vulnerability in asnc. No vendor fix is recorded yet; mitigation options are listed below.

Published

Sep 2, 2020

Updated

Oct 1, 2021

Affected

1 pkg

Patched

None yet

Exploits

None indexed

Exploitation data as of Oct 1, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

📦asnc

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

Description

All versions of asnc typosquatted a popular package of similar name and tracked users who had installed the incorrect package. The package uploaded information to a remote server including: name of the downloaded package, name of the intended package, the Node version and whether the process was running as sudo. There is no further compromise.

Recommendation

Remove the package from your dependencies and always ensure package names are typed correctly upon installation.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`asnc`	all versions	No fix

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for asnc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of asnc has shipped for GHSA-2p99-6f47-8x9j yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
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 `asnc` typosquatted a popular package of similar name and tracked users who had installed the incorrect package. The package uploaded information to a remote server including: name of the downloaded package, name of the intended package, the Node version and whether the process was running as sudo. There is no further compromise. ## Recommendation Remove the package from your dependencies and always ensure package names are typed correctly upon installation.

O3 Security · Impact-Aware SCA

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