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.

CVSS 4.0

2.1CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

CVSS 3.1

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

EPSS

0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-25)

CWE

CWE-755

Published

2025-10-24

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• bytecodealliance:wasmtime

Packages (OSV)

References

• 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

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