MalwarePublished 7 Jul 2026Updated 24 Sep 2026

zwcalx9 (RubyGems) · Malicious Code

Affects zwcalx9Source GCVE Database

Malicious package : remove zwcalx9 and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 16:06 UTC

Classification

Malicious package

Published to RubyGems · OSV MAL-2026-9852

What to do

Remove zwcalx9 from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
RubyGemszwcalx9`pkg:gem/zwcalx9`Other threats	Affected =0.0.494	Fixed in–

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Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: ghsa-malware (24ef315d1ae8b008b42224b7a136715219185bc2c073c5e718c8ff0d639343ae) --- Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/9fbb5fba02ba2f02395d3d2d43c31b2c482b7a9d/osv/malicious/rubygems/zwcalx9/MAL-2026-9852.json))

Impact

Use of the malicious 'zwcalx9' package version 0.0.494 could lead to execution of malicious code within environments that install and run this package. The exact impact is not detailed, but malicious packages typically pose risks such as unauthorized code execution, data compromise, or system integrity violations. No known active exploitation has been reported.

Defensive guidance

Avoid using the 'zwcalx9' RubyGems package version 0.0.494. Since this is a malicious package, the recommended action is to remove it from any environment where it is installed and to avoid installing it. Monitor RubyGems sources and use trusted packages only. Check vendor or repository advisories for updates or removal notices.

Summary

The RubyGems package 'zwcalx9' at version 0.0.494 has been identified as containing malicious code by the OpenSSF project and is listed under MAL-2026-9852. This is a case of a malicious package rather than a vulnerability due to coding errors or design flaws. The package is flagged in the malicious package database, indicating it should not be used. No further technical details or exploit mechanisms are provided in the available data.

References

github.com/advisories/GHSA-wp8j-m4hq-cmh8 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Jul 2026, 16:42 UTC

Technical details

References

Community reviews