How severe is GHSA-x3w4-mrmv-cw2x?

GHSA-x3w4-mrmv-cw2x has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-x3w4-mrmv-cw2x?

GHSA-x3w4-mrmv-cw2x affects the following packages: buffev-xor (npm). Ecosystems affected: npm.

How do I fix GHSA-x3w4-mrmv-cw2x?

No patched version of buffev-xor has shipped for GHSA-x3w4-mrmv-cw2x 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-x3w4-mrmv-cw2x in my npm dependencies?

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

How do I mitigate GHSA-x3w4-mrmv-cw2x 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-x3w4-mrmv-cw2x actively exploited in the wild?

No public exploit code has been indexed for GHSA-x3w4-mrmv-cw2x 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-x3w4-mrmv-cw2x published, and has it been updated?

GHSA-x3w4-mrmv-cw2x was published on September 3, 2020 and was last updated on September 29, 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 buffev-xorGHSA-x3w4-mrmv-cw2x

CRITICAL

GHSA-x3w4-mrmv-cw2x is a critical-severity (CVSS 9.8) vulnerability in buffev-xor. No vendor fix is recorded yet; mitigation options are listed below.

Published

Sep 3, 2020

Updated

Sep 29, 2021

Affected

1 pkg

Patched

None yet

Exploits

None indexed

Exploitation data as of Sep 29, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

📦buffev-xor

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

Version 2.0.2 contained malicious code. The package targeted the Ethereum cryptocurrency and performed transactions to wallets not controlled by the user.

Recommendation

Remove the package from your environment. Ensure no Ethereum funds were compromised.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`buffev-xor`	≥ 0.0.0	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 buffev-xor, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of buffev-xor has shipped for GHSA-x3w4-mrmv-cw2x 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

Version 2.0.2 contained malicious code. The package targeted the Ethereum cryptocurrency and performed transactions to wallets not controlled by the user. ## Recommendation Remove the package from your environment. Ensure no Ethereum funds were compromised.

O3 Security · Impact-Aware SCA

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