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JLSEC-2026-109 CVSS_V4

Deno run with --allow-read and --deny-read flags results in allowed

JLSEC Published
Modified
Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Affected Packages
Deno_jll >= 2.0.0+0, < 2.6.3+0
Aliases / Upstream
EUVD-2025-16912 GHSA-xqxc-x6p3-w683 CVE-2025-48888

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.

References