Low severity · published Oct 24, 2025
CVE-2025-62711
Wasmtime is a runtime for WebAssembly
3.1
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
Wasmtime · Bytecodealliance
38.0.0 before 38.0.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-62711
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-62711
Patch
https://github.com/bytecodealliance/wasmtime/commit/192f2fcdadfec9d0cf6b58548a85a7307450cbf5
Patch
https://github.com/bytecodealliance/wasmtime/pull/11592
Patch
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4h67-722j-5pmc
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