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CVE-2021-21415: Visual Studio Code Prisma Extension Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-29 · updated 2026-06-17
• Weakness: CWE-94

Description

Prisma VS Code a VSCode extension for Prisma schema files. This is a Remote Code Execution Vulnerability that affects all versions of the Prisma VS Code extension older than 2.20.0. If a custom binary path for the Prisma format binary is set in VS Code Settings, for example by downloading a project that has a .vscode/settings.json file that sets a value for "prismaFmtBinPath". That custom binary is executed when auto-formatting is triggered by VS Code or when validation checks are triggered after each keypress on a *.prisma file. Fixed in versions 2.20.0 and 20.0.27. As a workaround users can either edit or delete the `.vscode/settings.json` file or check if the binary is malicious and delete it.

Affected products

• prisma language-tools: before 2.20.0 — fixed in 2.20.0

How to fix

Upgrade to a fixed version: prisma language-tools 2.20.0. Check the vendor advisory for mitigations.

References

• https://github.com/prisma/language-tools/pull/750
• https://github.com/prisma/language-tools/security/advisories/GHSA-4rf9-43m7-x828
• https://marketplace.visualstudio.com/items?itemName=Prisma.prisma
• https://marketplace.visualstudio.com/items?itemName=Prisma.prisma-insider
• https://github.com/prisma/language-tools/pull/750
• https://github.com/prisma/language-tools/security/advisories/GHSA-4rf9-43m7-x828
• https://marketplace.visualstudio.com/items?itemName=Prisma.prisma
• https://marketplace.visualstudio.com/items?itemName=Prisma.prisma-insider

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