Vulnerability in Bytecodealliance Wasmtime
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.
EPSS: 0.004 (32.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Bytecodealliance Wasmtime — versions >= 38.0.0, < 38.0.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-62711?
- CVE-2025-62711 is a low-severity vulnerability in Bytecodealliance Wasmtime, classified under Improper Handling of Exceptional Conditions. CVSS score: 3.1/10. Published 2025-10-24.
- How severe is CVE-2025-62711?
- Low severity. CVSS v3 base score is 3.1 out of 10.