CVE-2025-58749: webassembly micro Integer Overflow

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

CWE-190 Integer Overflow

CWE-822 CWE-822

Affected Products

Vendor	Product	Versions
bytecodealliance	webassembly_micro_runtime	< 2.4.2

References

Advisories & Patches

https://github.com/bytecodealliance/wasm-micro-runtime/commit/95f506a6e77d3ac7588eac7263f95558edfa7f3b

Exploits

https://github.com/bytecodealliance/wasm-micro-runtime/security/advisories/GHSA-xj5p-r8jq-pw47 https://github.com/bytecodealliance/wasm-micro-runtime/security/advisories/GHSA-xj5p-r8jq-pw47

Frequently Asked Questions

What is CVE-2025-58749? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-58749? +

CVE-2025-58749 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-58749? +

CVE-2025-58749 affects products from bytecodealliance, specifically: webassembly_micro_runtime. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-58749? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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