CVE-2025-43853CWE-61

iwasm vulnerable to filesystem sandbox escape with symlink when using uvwasi feature

High · published May 15, 2025

CVSS v4.0
7.0
EPSS
0%
Percentile
20.7
In the wild
Unconfirmed
What it is

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. Anyone running WAMR up to and including version 2.2.0 or WAMR built with libc-uvwasi on Windows is affected by a symlink following vulnerability. On WAMR running in Windows, creating a symlink pointing outside of the preopened directory and subsequently opening it with create flag will create a file on host outside of the sandbox. If the symlink points to an existing host file, it's also possible to open it and read its content. Version 2.3.0 fixes the issue.

The record
Technical detail
CVSS v4.0
7.0 · HIGH
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS
0.00293 · 20.7th percentile
Weakness
CWE-61 · UNIX Symbolic Link (Symlink) Following
Published
2025-05-15T17:13Z
EPSS history
Timeline
  • 15 MAY 17:13Z
    iwasm vulnerable to filesystem sandbox escape with symlink when using uvwasi feature
    cvelistv5