---
title: "CVE-2026-104849: Tinypool - Prototype Pollution"
description: "Tinypool < 2.1.2 contains a prototype pollution vulnerability caused by reading filename from a caller-supplied options object without own property check in pool.run, letting attackers load arbitrary JavaScript and read or modify task data, exploit requires prototype pollution."
url: https://panop.io/threat-heartbeat/CVE-2026-104849/
---

# CVE-2026-104849 Tinypool - Prototype Pollution

Tinypool < 2.1.2 contains a prototype pollution vulnerability caused by reading filename from a caller-supplied options object without own property check in pool.run, letting attackers load arbitrary JavaScript and read or modify task data, exploit requires prototype pollution.

CVSS base score 9.5 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.39% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104849)

## Details

Type

Prototype Pollution

Impact

Remote Code Execution, Data Tampering, Information Disclosure

CVSS vector

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

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Update to version 2.1.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104849](https://nvd.nist.gov/vuln/detail/CVE-2026-104849)
- [https://github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf](https://github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf)
- [https://github.com/tinylibs/tinypool/pull/135](https://github.com/tinylibs/tinypool/pull/135)
- [https://github.com/tinylibs/tinypool/releases/tag/v2.1.2](https://github.com/tinylibs/tinypool/releases/tag/v2.1.2)
- [https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr](https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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