MalwarePublished 7 Jul 2026Updated 24 Sep 2026

zwkopt13 (RubyGems) · Malicious Code

Affects zwkopt13Source GCVE Database

Malicious package : remove zwkopt13 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-2026-9876

What to do

Remove zwkopt13 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
RubyGemszwkopt13`pkg:gem/zwkopt13`Other threats	Affected =0.0.3503	Fixed in–

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Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: ghsa-malware (5f70eac68aa2ed01016264e0dadc1050b86b9b6f317935bd1052052a1be7a05b) --- Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/9fbb5fba02ba2f02395d3d2d43c31b2c482b7a9d/osv/malicious/rubygems/zwkopt13/MAL-2026-9876.json))

Impact

Use of the malicious package version 0.0.3503 could lead to compromise depending on the payload and intent of the malicious code, though no specific impact details or exploitation reports are provided. The presence of malicious code in a package can lead to unauthorized actions, data compromise, or system integrity issues if integrated into projects.

Defensive guidance

Users should avoid using the affected version (=0.0.3503) of the 'zwkopt13' package. It is recommended to verify package integrity and source authenticity before installation. Monitor official advisories for updates or removal of the malicious package from repositories.

Summary

The package 'zwkopt13' in the RubyGems ecosystem, specifically version 0.0.3503, has been flagged as containing malicious code according to the OpenSSF malicious packages database. There is no CVSS score or detailed technical vulnerability description available. No exploits are currently known to be in the wild. This is a supply chain threat involving a malicious package rather than a software flaw.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Jul 2026, 16:39 UTC

Technical details

References

Community reviews