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    CVE-2025-43853

    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.

    Published:May 15, 2025
    Last Modified:Sep 19, 2025
    EPS:May 15, 2025
    EPSS Score:0.00034
    CVSS Score:5.5

    Affected Products

    Vendor
    Bytecodealliance
    Product
    Webassembly Micro Runtime

    Exploits

    https://github.com/bytecodealliance/wasm-micro-runtime/security/advisories/GHSA-8fc8-4g25-c8m7

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-27 Leveraging Race Conditions via Symbolic Links

    Related CVEs

    CVE-2025-64713 (CVSS 5.1) — WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to version 2.4.…
    CVE-2025-64704 (CVSS 4.7) — WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to version 2.4.…
    CVE-2025-58749 (CVSS 2.1) — WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. In WAMR versions prio…
    CVE-2025-54126 (CVSS 6.9) — The WebAssembly Micro Runtime's (WAMR) iwasm package is the executable binary built with WAMR VMcore which sup…
    CVE-2024-27532 (CVSS 7.5) — wasm-micro-runtime (aka WebAssembly Micro Runtime or WAMR) 06df58f is vulnerable to NULL Pointer Dereference i…
    CVE-2024-25431 (CVSS 7.8) — An issue in bytecodealliance wasm-micro-runtime before v.b3f728c and fixed in commit 06df58f allows a remote a…
    CVE-2024-34251 (CVSS 7.5) — An out-of-bound memory read vulnerability was discovered in Bytecode Alliance wasm-micro-runtime v2.0.0 which …
    CVE-2024-34250 (CVSS 6.2) — A heap buffer overflow vulnerability was discovered in Bytecode Alliance wasm-micro-runtime v2.0.0 which allow…
    CVE-2023-52284 (CVSS 5.5) — Bytecode Alliance wasm-micro-runtime (aka WebAssembly Micro Runtime or WAMR) before 1.3.0 can have an "double …
    CVE-2023-48105 (CVSS 7.5) — An heap overflow vulnerability was discovered in Bytecode alliance wasm-micro-runtime v.1.2.3 allows a remote …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High