{"id":"CVE-2026-76833","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-76833","summary":"@cgauge/yaml npm Package Arbitrary Code Execution via eval() YAML Tag","details":"@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.","published":"2026-08-20T13:33:14.674Z","modified":"2026-08-22T03:49:48.204189459Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76833.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76833"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cgauge-yaml-npm-package-arbitrary-code-execution-via-eval-yaml-tag"},{"type":"PACKAGE","url":"https://github.com/cgauge/packages"},{"type":"ARTICLE","url":"https://gist.github.com/arjunjaincs/35da3a80b4b16f324f194acec18489ba"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T03:49:48.204189459Z"}}