CVE-2024-27936: Deno interactive permission prompt spoofing via improper ANSI stripping

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-03-21 · updated 2026-06-17
Weakness: CWE-150

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. Starting in version 1.32.1 and prior to version 1.41.0 of the deno library, maliciously crafted permission request can show the spoofed permission prompt by inserting a broken ANSI escape sequence into the request contents. Deno is stripping any ANSI escape sequences from the permission prompt, but permissions given to the program are based on the contents that contain the ANSI escape sequences. Any Deno program can spoof the content of the interactive permission prompt by inserting a broken ANSI code, which allows a malicious Deno program to display the wrong file path or program name to the user. Version 1.41.0 of the deno library contains a patch for the issue.

Affected products

denoland deno: from 1.32.1 before 1.41.0 — fixed in 1.41.0
Deno Runtime: from 0.103.0 before 0.147.0 — fixed in 0.147.0

How to fix

Upgrade to a fixed version: denoland deno 1.41.0; Deno Runtime 0.147.0. Check the vendor advisory for mitigations.

References

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