Versions of base64url before 3.0.0 are vulnerable to to out-of-bounds reads as it allocates uninitialized Buffers when number is passed in input on Node.js 4.x…
Full advisory text at GitHub advisory.
npm package report
Is base64url safe?
base64url (npm) has 1 known vulnerability, the worst rated MODERATE. Upgrade to 3.0.0 or later to clear it. No malicious-package signal is recorded.
// reach
0 direct dependencies
none carry a known advisory
35 packages depend on it
an advisory here reaches each of them
Create a free accountfor every dependency path, dependent and what to upgrade
// ai model usage
Tracked for PyPI packages. HuggingFace models declare Python dependencies, so npm packages are not covered.
cvss
5.0
medium
severity band, no base score published
epss
not scored
chance of exploitation in 30 days
xyz score
not scored
CyberXYZ composite out of 10
fig. 01 — GHSA-rvg8-pwq2-xj7q, the advisory selected below
// 1 advisories
Is base64url safe to install?
CyberXYZ does not call a package safe in absolute terms. It records 1 known vulnerability for base64url (npm), the worst rated MODERATE, and no malicious-package signal. Whether it is acceptable depends on the version you run.
Does base64url have known vulnerabilities?
Yes. CyberXYZ records 1 known vulnerability for base64url (npm), the worst rated MODERATE. They are GHSA-rvg8-pwq2-xj7q.
Which version of base64url should I use?
3.0.0 or later clears every advisory recorded for base64url (npm). Check the release you pick before installing it.
How do I check base64url before installing?
Search base64url in CyberXYZ Check at https://cyberxyz.io/check?q=base64url. The xyz Scanner checks a project's dependencies, and CyberXYZ Proxy checks each package as it is installed.
Checked 2026-11-14 at 06:17 UTC. The most recent advisory here was published 2020-09-01. Updated continuously from NVD, GHSA, OSV and CNA feeds.