CVE-2026-76833

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.

CVSS Vector

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