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npm · Malicious package advisory

Malware

async-sed-small-xml-upsilon

GHSA-mcrc-4rjw-9j9m

Malicious code in async-sed-small-xml-upsilon (npm)

Details

**Severity:** Critical

**Affected versions:** `> 0`

The package async-sed-small-xml-upsilon was found to contain malicious code.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/672afd706555c110bda936d989979013c03d62f2/osv/malicious/npm/async-sed-small-xml-upsilon/MAL-2025-14992.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/672afd706555c110bda936d989979013c03d62f2/osv/malicious/npm/async-sed-small-xml-upsilon/MAL-2025-14992.json
- https://github.com/advisories/GHSA-mcrc-4rjw-9j9m

Compromised versions (1)

  • > 0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.