MalwarePublished 7 Jul 2026Updated 24 Sep 2026

zwcalx11 (RubyGems) · Malicious Code

Affects zwcalx11Source GCVE Database

Malicious package : remove zwcalx11 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-2026-9842

What to do

Remove zwcalx11 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
RubyGemszwcalx11`pkg:gem/zwcalx11`Other threats	Affected =0.0.497	Fixed in–

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Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: ghsa-malware (1d9e043ea2cd24d4f83f17bb3aa853bbc64a18ce18228cbc5dc4f296e574e076) --- Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/9fbb5fba02ba2f02395d3d2d43c31b2c482b7a9d/osv/malicious/rubygems/zwcalx11/MAL-2026-9842.json))

Impact

Use of the 'zwcalx11' package version 0.0.497 may introduce malicious code into dependent applications or environments, potentially leading to compromise of system integrity or confidentiality. However, no specific impact details or exploitation reports are available. The presence of malicious code in a package can undermine trust in the software supply chain and may facilitate unauthorized actions by attackers.

Defensive guidance

Users should avoid using the 'zwcalx11' package version 0.0.497. It is recommended to remove this package from projects and replace it with trusted alternatives. Monitor official RubyGems and OpenSSF advisories for updates or removal notices. Since this is a malicious package, standard vulnerability patching does not apply; prevention by not installing or removing the package is the primary mitigation.

Summary

The 'zwcalx11' RubyGems package at version 0.0.497 has been identified as containing malicious code by the OpenSSF malicious packages project and is cataloged under MAL-2026-9842. This classification indicates the package is intentionally harmful or compromised, posing a security risk if used. No further technical details, CVSS scoring, or exploit information is available from the source data. The package is flagged as malicious rather than a traditional vulnerability, emphasizing the risk of supply chain compromise.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Jul 2026, 16:43 UTC

Technical details

References

Community reviews