CVE-2025-58749

MEDIUM

WebAssembly Micro Runtime < 2.4.2 - Denial of Service via Memory Fill Instruction

Title source: llm
STIX 2.1

Description

WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. In WAMR versions prior to 2.4.2, when running in LLVM-JIT mode, the runtime cannot exit normally when executing WebAssembly programs containing a memory.fill instruction where the first operand (memory address pointer) is greater than or equal to 2147483648 bytes (2GiB). This causes the runtime to hang in release builds or crash in debug builds due to accessing an invalid pointer. The issue does not occur in FAST-JIT mode or other runtime tools. This has been fixed in version 2.4.2.

References (2)

Core 2

Scores

CVSS v3 5.3
EPSS 0.0034
EPSS Percentile 26.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-190 CWE-822
Status published
Products (1)
bytecodealliance/webassembly_micro_runtime < 2.4.2
Published Sep 16, 2025
Tracked Since Feb 18, 2026