Improper Handling of Unicode Encoding Affecting deno package, versions <2.7.14
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-DENO-17660659
- published27 Jun 2026
- disclosed16 Jun 2026
- creditUnknown
Introduced: 16 Jun 2026
NewCVE-2026-49401 (opens in a new tab)How to fix?
Upgrade deno to version 2.7.14 or higher.
Overview
deno is an a simple, modern and secure runtime for JavaScript and TypeScript that uses V8 and is built in Rust.
Affected versions of this package are vulnerable to Improper Handling of Unicode Encoding via the path comparison process. An attacker can bypass intended access restrictions by supplying alternate Unicode or case-equivalent spellings of file paths on macOS APFS volumes. This is only exploitable if the application is running on macOS with APFS and relies on deny-list flags with paths containing characters that have alternate Unicode spellings or case-sensitive aliases.
Workaround
This vulnerability can be mitigated by preferring allow-list flags over deny-list flags and avoiding reliance on case-sensitivity of paths on macOS for security boundaries.