What’s Vulnerable › Vulnerabilities

CVE-2026-76833: @cgauge/yaml npm Package Arbitrary Code Execution via eval() YAML Tag

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-20 · updated 2026-10-18
• Weakness: CWE-95

Description

@cgauge/yaml npm package contains an arbitrary code execution vulnerability that allows attackers to execute arbitrary JavaScript by embedding a custom !js YAML tag whose construct callback unconditionally calls eval() on attacker-supplied string values during document parsing. Any application parsing untrusted YAML input with this library exposes full Node.js runtime authority, including environment variable access, filesystem read/write, network access, and subprocess execution, with no safe-mode alternative or opt-out mechanism available.

Affected products

• cgauge @cgauge/yaml: through 0.27.0

References

• https://gist.github.com/arjunjaincs/35da3a80b4b16f324f194acec18489ba
• https://github.com/cgauge/packages
• https://www.vulncheck.com/advisories/cgauge-yaml-npm-package-arbitrary-code-execution-via-eval-yaml-tag
• https://gist.github.com/arjunjaincs/35da3a80b4b16f324f194acec18489ba

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