Malicious code in pentest-copilot (RubyGems)
Published Sources: OSV (Schadpakete)
- Malicious package
What is affected, what to do
Uninstall the package, isolate affected environments and rotate credentials that were available during installation.
Not sure whether and how you are affected? Ask a question about this vulnerability
Malicious package
RubyGemspentest-copilot
“pentest-copilot” is registered as malicious in the RubyGems repository. Anyone who installed the package should uninstall it immediately, isolate affected environments and rotate credentials that were present during installation.
Affected versions (1)
- 1.0.1
purl: pkg:gem/pentest-copilot
Sources (2)
ossf-package-analysis
Versions from this source: 1.0.1
sha256: 8ed8a5f6d36e52a081b16492d7bc0cd65dc392d085384781cf3d661d47fca019
amazon-inspector
IN-MAL-2026-022650Versions from this source: 1.0.1
sha256: 23e305059e2c1f7f8f37b8478aa90214d1e916fc3f2287eb90f7bca7e9dcac32
The OSSF `malicious-packages` namespace lists packages flagged as malicious by static analysis or sandbox detonation. An entry here is a confirmed finding, not a suspicion.
Metrics
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XIEM Effective CVSS
No value is available for this vulnerability.
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CVSS v3
No value is available for this vulnerability.
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EPSS score
No value is available for this vulnerability.
Show all metrics
- Severity
- High
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 30.00 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
The gem declares an extension script (mkrf_conf.rb / RakeBuilder) that runs automatically on gem install. At install time it collects installer-side identifiers (current working directory, home directory, hostname, login name) and reads local files /etc/resolv.conf, /etc/passwd, and /etc/hosts, then performs a DNS lookup to the Burp Collaborator subdomain vfe1kgmcry39220zb5fl06hi49acy2mr.oastify.com and opens a TLS connection to the same host on port 443, POSTing the collected host identifiers and file contents in the request body. The Collaborator destination is attacker-controlled out-of-band infrastructure typical of install-time exfiltration beacons.
The OpenSSF Package Analysis project identified 'pentest-copilot' @ 1.0.1 (rubygems) as malicious.
It is considered malicious because:
- The package communicates with a domain associated with malicious activity.