NULL pointer dereference in wasm-micro-runtime - CVE-2025-58749
Published: April 24, 2026
Vulnerability identifier: #VU127499
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-58749
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Bytecode Alliance
Affected software:
wasm-micro-runtime
wasm-micro-runtime
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to invalid pointer access in LLVM-JIT mode in iwasm when executing a wasm program containing a memory.fill instruction with the first operand greater than or equal to 2 GiB. A local user can run a specially crafted wasm program to cause a denial of service.
The issue occurs in LLVM-JIT mode; release builds hang while debug builds crash.
How to mitigate CVE-2025-58749
Install security update from vendor's website.