Read the docs
TI-2020-10967 Aliases CVE-2020-14000GHSA-vc9j-fhvv-8vrf

MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads…

Priority MEDIUM 47CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented. NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.

Why it matters now

EPSS 0.0283 86th percentileScored 2026-11-07
Fix Fixed scratch-vm (npm): 0.2.0-prerelease.20200714185213

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—scratch-vm (npm)before 0.2.0-prerelease.202007141852130.2.0-prerelease.20200714185213Patch availableGHSA-vc9j-fhvv-8vrf
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • scratch-vm (npm) Vendor— Affected before 0.2.0-prerelease.20200714185213 Fixed in 0.2.0-prerelease.20200714185213 Patch available GHSA-vc9j-fhvv-8vrf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mit:scratch-vm:*:*:*:*:*:*:*:*before 0.2.0-prerelease.20200714185213Vulnerablemoos-ivp
  • cpe:2.3:a:mit:scratch-vm:*:*:*:*:*:*:*:* Versions before 0.2.0-prerelease.20200714185213 Vulnerable ·moos-ivp

Remediation

  • Fix · GHSA-vc9j-fhvv-8vrf scratch-vm (npm) Fixed in 0.2.0-prerelease.20200714185213 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-14000
  2. 2026-10-03 Alias added: GHSA-vc9j-fhvv-8vrf

References

Advisory 3

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences