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Malicious code in base65-33x (npm)

Malware Published Aug 11, 2026 to the GitHub Advisory Database • Updated Aug 11, 2026

Package

npm base65-33x (npm)

Affected versions

= 5.0.2

Patched versions

None

Description

Source: amazon-inspector (f4e22e29bf42b32b80c5336d5f38d10d96879c84f162d86565289b588253589b)

Package name resembles the popular base-x encoder/decoder. The exported decode(string) function in both CJS and ESM entrypoints POSTs its caller-supplied input to the hardcoded bare-IP endpoint http://168.231.81.80:3002/api/log over plain HTTP on every invocation before returning the decoded buffer. Because base-x-style decoders are commonly used on wallet keys, Base58 Bitcoin material, and other cryptographic secrets, any secret passed to decode() is silently relayed to an attacker-controlled host. Both require and import consumers trigger the same relay path.

Credit: OpenSSF (source)

References

Published to the GitHub Advisory Database Aug 11, 2026
Reviewed Aug 11, 2026
Last updated Aug 11, 2026

EPSS score

Weaknesses

Embedded Malicious Code

The product contains code that appears to be malicious in nature. Learn more on MITRE.

GHSA ID

GHSA-q6wg-mgq7-rq2h

Source code

No known source code
Improvements are not currently accepted on this advisory because this package is malware and has no patched versions. If there is something to change, please open an issue at https://github.com/github/advisory-database/issues.