Intel

AIKIDO-2026-10535

deno_core is vulnerable to Improper Input Validation

Improper Input Validation Pre-CVE
Found by Aikido Intel before public disclosure or CVE publication.
Published Apr 24, 2026

68

Medium Risk

This Affects:

RUSTdeno_core
0.274.0 - 0.397.0
Fixed in 0.398.0
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TL;DR

Affected versions of this package are vulnerable to an improper network permission bypass where deny rules could be evaded by using alternative representations of the same IP address, such as IPv4-mapped IPv6 addresses or numeric hostname aliases that resolve to denied addresses. This may allow restricted connections to hosts like localhost or denied subnets despite explicit deny-net rules. An attacker might exploit this by supplying a blocked target in decimal, hexadecimal, or IPv4-mapped IPv6 form (for example, 2130706433, 0x7f000001, or ::ffff:127.0.0.1) to reach internal services, localhost-only ports, or other protected network resources that should have been denied.

Who does this affect?

You are affected if you are using a version that falls within the vulnerable range.

Background info

deno_core is vulnerable to Improper Input Validation in versions 0.274.0 - 0.397.0.

How to fix this

Upgrade the deno_core library to the patch version.