CVE-2025-48888: Deno

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Starting in version 1.41.3 and prior to versions 2.1.13, 2.2.13, and 2.3.2, `deno run --allow-read --deny-read main.ts` results in allowed, even though 'deny' should be stronger. The result is the same with all global unary permissions given as `--allow-* --deny-*`. This only affects a nonsensical combination of flags, so there shouldn't be a real impact on the userbase. Users may upgrade to version 2.1.13, 2.2.13, or 2.3.2 to receive a patch.

Affected products

• Deno Deno: from 1.41.3, before 2.1.13 (fixed in 2.1.13); from 2.2.0, before 2.2.13 (fixed in 2.2.13); from 2.3.0, before 2.3.2 (fixed in 2.3.2)

Published 2025-06-04. Last modified 2026-06-17.