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gem · Malicious package advisory

Malware

zwan_cal_jan1

GHSA-x6jw-jh72-4mqj

Malicious code in zwan_cal_jan1 (RubyGems)

Details

**Severity:** Critical

**Affected versions:** `= 0.0.131`

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/9fbb5fba02ba2f02395d3d2d43c31b2c482b7a9d/osv/malicious/rubygems/zwan_cal_jan1/MAL-2026-9837.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/9fbb5fba02ba2f02395d3d2d43c31b2c482b7a9d/osv/malicious/rubygems/zwan_cal_jan1/MAL-2026-9837.json
- https://github.com/advisories/GHSA-x6jw-jh72-4mqj

Compromised versions (1)

  • = 0.0.131

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