CVE-2025-62711

Description

Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before 38.0.3, the implementation of component-model related host-to-wasm trampolines in Wasmtime contained a bug where it's possible to carefully craft a component, which when called in a specific way, would crash the host with a segfault or assert failure. Wasmtime 38.0.3 has been released and is patched to fix this issue. There are no workarounds.

CVSS v3.1 Score

3.1

LOW

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

Weakness Type (CWE)

CWE-755 CWE-755

Affected Products

Vendor	Product	Versions
bytecodealliance	wasmtime	38.0.0 — 38.0.3

References

Advisories & Patches

https://github.com/bytecodealliance/wasmtime/commit/192f2fcdadfec9d0cf6b58548a85a7307450cbf5 https://github.com/bytecodealliance/wasmtime/pull/11592 https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4h67-722j-5pmc

Frequently Asked Questions

What is CVE-2025-62711? +

Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before 38.0.3, the implementation of component-model related host-to-wasm trampolines in Wasmtime contained a bug where it's possible to carefully craft a component, which when called in a specific way, would crash the host with a segfault or assert failure. Wasmtime 38.0.3 has been released and is patched to fix this issue. There are no workarounds. It has a CVSS v3.1 base score of 3.1 (LOW).

How severe is CVE-2025-62711? +

CVE-2025-62711 has a CVSS v3.1 score of 3.1 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-62711? +

CVE-2025-62711 affects products from bytecodealliance, specifically: wasmtime. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62711? +

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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