Skip to content
OpenAdvisories
Medium · 6.9 CVE-2025-54126 EUVD-2025-23050

WebAssembly Micro Runtime's `--addr-pool` option allows all IPv4 addresses when subnet mask is not specified

Published Jul 29, 2025 · Updated Jul 30, 2025 · Assigned by GitHub_M

Description

The WebAssembly Micro Runtime's (WAMR) iwasm package is the executable binary built with WAMR VMcore which supports WebAssembly System Interface (WASI) and command line interface. In versions 2.4.0 and below, iwasm uses --addr-pool with an IPv4 address that lacks a subnet mask, allowing the system to accept all IP addresses. This can unintentionally expose the service to all incoming connections and bypass intended access restrictions. Services relying on --addr-pool for restricting access by IP may unintentionally become open to all external connections. This may lead to unauthorized access in production deployments, especially when users assume that specifying an IP without a subnet mask implies a default secure configuration. This is fixed in version 2.4.1.

Affected products

VendorProductAffectedFixed
bytecodealliance wasm-micro-runtime < 2.4.1 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 fluent-bit 3.1.9-5 —
Azure Linux 2 (CBL-Mariner) fluent-bit 3.0.6-3 —

References