How severe is GHSA-cr4x-w2v7-4mmf?

GHSA-cr4x-w2v7-4mmf has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-cr4x-w2v7-4mmf?

GHSA-cr4x-w2v7-4mmf affects the following packages: bufver-xor (npm). Ecosystems affected: npm.

How do I fix GHSA-cr4x-w2v7-4mmf?

No patched version of bufver-xor has shipped for GHSA-cr4x-w2v7-4mmf 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-cr4x-w2v7-4mmf in my npm dependencies?

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

How do I mitigate GHSA-cr4x-w2v7-4mmf 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-cr4x-w2v7-4mmf actively exploited in the wild?

No public exploit code has been indexed for GHSA-cr4x-w2v7-4mmf 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-cr4x-w2v7-4mmf published, and has it been updated?

GHSA-cr4x-w2v7-4mmf 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 bufver-xorGHSA-cr4x-w2v7-4mmf

CRITICAL

GHSA-cr4x-w2v7-4mmf is a critical-severity (CVSS 9.8) vulnerability in bufver-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

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

bufver-xornpm

5downloads / week

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	`bufver-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 bufver-xor, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of bufver-xor has shipped for GHSA-cr4x-w2v7-4mmf 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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