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Supply chain compromise via malicious @cap-js/openapi

Critical severity GitHub Reviewed Published May 19, 2026 in cap-js/openapi

Package

npm @cap-js/openapi (npm)

Affected versions

= 1.4.1

Patched versions

1.4.2

Description

Impact

On May 19, 2026, a compromised version of @cap-js/openapi@1.4.1 was published.
The malicious packages harvested credentials and attempted self-propagation.
If a compromised version was installed, all credentials accessible on that machine (npm tokens, cloud provider credentials, SSH keys, GitHub PATs) should be considered compromised.

Patches

Upgrade to @cap-js/openapi >= 1.4.2
If the compromised version was ever installed, rotate all affected credentials.

Workarounds

No workarounds.

References

References

@patricebender patricebender published to cap-js/openapi May 19, 2026
Published to the GitHub Advisory Database Jun 4, 2026
Reviewed Jun 4, 2026

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS score

Weaknesses

Embedded Malicious Code

The product contains code that appears to be malicious in nature. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-jpvj-wpmj-h7rv

Source code

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