# CVE-2026-76833

## Summary

- **CVE ID:** CVE-2026-76833
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-95
- **Published:** Aug 20, 2026
- **Last Modified:** Aug 20, 2026

## 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 (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._