Vulnerability · Published Oct 24, 2025 · Assigned by GitHub_M

CVE-2025-62711Wasmtime vulnerable to segfault when using component resources

Low 2.1

In plain English

A low-severity security flaw in wasmtime from bytecodealliance. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 4.0)2.1Low

Exploit odds (30 days)0.4%top 64.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:25.10	rust-wasmtime	no fix listed	UBUNTU-CVE-2025-62711
Ubuntu:26.10	rust-wasmtime	no fix listed	UBUNTU-CVE-2025-62711

Affected products (as reported)

Vendor	Product	Versions
bytecodealliance	wasmtime	>= 38.0.0, < 38.0.3

Weakness: CWE-755 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

References

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