CVE-2026-104848Tinypool: Prototype Pollution gadget in worker options leads to Remote Code Execution
Updated under an hour ago ()
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It affects tinylibs tinypool. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.50%, higher than 41% of scored CVEs.
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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.
- CVSS
- 9.5 CRITICAL (v4.0, CNA)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
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.50% (percentile 41)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Oct 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
tinylibs tinypool tinylibs:tinypool (from the name) | before 2.1.1 | CNA record |
References
- https://github.com/tinylibs/tinypool/security/advisories/GHSA-5gmw-xhrv-c9v3x-refsource-confirm
- https://github.com/tinylibs/tinypool/pull/134x-refsource-misc
- https://github.com/tinylibs/tinypool/commit/24df4e730e7d0857a6d226c9b58f8924227404fdx-refsource-misc
- https://github.com/tinylibs/tinypool/releases/tag/v2.1.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.