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

Quick assessment

Affected
cgauge @cgauge/yaml
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

@cgauge/yaml npm 软件包存在任意代码执行漏洞。攻击者可以通过嵌入自定义的 YAML 标签，在文档解析期间无条件地对攻击者提供的字符串值调用 ，从而执行任意 JavaScript 代码。使用该库解析不受信任的 YAML 输入的任何应用程序都将暴露完整的 Node.js 运行时权限，包括环境变量访问、文件系统读写、网络访问以及子进程执行，且不提供任何安全模式替代方案或退出机制。

CVSS 7.8 · High EPSS 0.15% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
cgauge @cgauge/yaml ≤ 0.27.0 affected
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I. Basic Information for CVE-2026-76833

Vulnerability Information
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Vulnerability Title
@cgauge/yaml npm Package Arbitrary Code Execution via eval() YAML Tag
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cgauge @cgauge/yaml 0 ~ 0.27.0 -

II. Public POCs for CVE-2026-76833

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: uid=0(root) gid=0(root) groups=0(root) | --- | PROOF_8047eb0e83c5e4fa
Reproduction recording is a Pro+ exclusive
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claude_code · 4447 chars
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III. Intelligence Information for CVE-2026-76833

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Vendor Advisories for CVE-2026-76833 (1)

Proof of Concept for CVE-2026-76833 (1)

IV. Related Vulnerabilities

Same weakness: CWE-95

V. Comments for CVE-2026-76833

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