CVE-2024-27931: Insufficient permission checking in `Deno.makeTemp*` APIs

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-03-05 · updated 2026-06-17
Weakness: CWE-20

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. Insufficient validation of parameters in `Deno.makeTemp*` APIs would allow for creation of files outside of the allowed directories. This may allow the user to overwrite important files on the system that may affect other systems. A user may provide a prefix or suffix to a `Deno.makeTemp*` API containing path traversal characters. This is fixed in Deno 1.41.1.

Affected products

denoland deno: before 1.41.1 — fixed in 1.41.1

How to fix

Upgrade to a fixed version: denoland deno 1.41.1. Check the vendor advisory for mitigations.

References

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