EUVD-2026-91718
GHSA-5gmw-xhrv-c9v3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AC:H because a pre-existing prototype-pollution primitive and a subsequent worker spawn are required; S:C as attacker code escapes the library to run with full host-process authority over secrets and build artifacts.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.1, Tinypool constructs ThreadPool.options from a normal options object and reads the execArgv and env worker options in dist/index.js, allowing values inherited from a polluted Object.prototype to be copied into own properties and passed to worker_threads.Worker. An attacker who can first pollute either property can cause each newly spawned worker to load attacker-selected JavaScript through command-line preload arguments or NODE_OPTIONS, resulting in code execution with the host process's privileges and possible access to CI secrets, signing material, or build artifacts. This issue is fixed in version 2.1.1.
Articles & Coverage 2
AnalysisAI
Prototype pollution in the Tinypool npm package prior to 2.1.1 escalates to code execution: an unauthenticated remote attacker who can first pollute Object.prototype.execArgv or Object.prototype.env.NODE_OPTIONS (via a separate prototype-pollution flaw in the host application) has those inherited values copied into ThreadPool.options and forwarded to worker_threads.Worker, so every newly spawned worker loads attacker-supplied JavaScript through --import/--require preload arguments or NODE_OPTIONS. The payload executes with the host process's privileges, potentially exposing CI secrets, signing material, or build artifacts. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the host application ALREADY has a prototype-pollution vulnerability allowing the attacker to set Object.prototype.execArgv (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a high-severity prototype-pollution-to-RCE issue (CWE-1321) in Tinypool, carrying a vendor CVSS 4.0 base score of 9.5 (AV:N/AC:L/AT:P/PR:N/UI:N with full High vulnerable- and subsequent-system impact). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Primary fix: upgrade Tinypool to version 2.1.1 or later - the vendor-released patch (release v2.1.1, commit 24df4e7, PR #134) switches the options assembly to Object.assign(Object.create(null), ...), eliminating the prototype-inheritance sink. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Node.js applications, CI/CD runners, and build systems for dependencies on the Tinypool npm package, prioritizing any version prior to 2.1.1; block deployments of affected pipelines that accept untrusted input, restrict NODE_OPTIONS and worker preload arguments such as --import/--require, enable Node.js prototype-pollution mitigations like --disable-proto=throw where compatible, and rotate CI secrets, signing keys, and build credentials that may have been exposed. …
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