CVE-2025-62711— Wasmtime vulnerable to segfault when using component resources
Quick assessment
Affected
bytecodealliance wasmtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
wasmtime是Bytecode Alliance开源的一个轻量级WebAssembly运行时。 Wasmtime 38.0.0版本至38.0.3之前版本存在安全漏洞，该漏洞源于组件模型相关的主机到wasm跳板实现存在缺陷，可能导致段错误或断言失败。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-62711
Vulnerability Information
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Vulnerability Title
Wasmtime vulnerable to segfault when using component resources
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
wasmtime 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wasmtime是Bytecode Alliance开源的一个轻量级WebAssembly运行时。 Wasmtime 38.0.0版本至38.0.3之前版本存在安全漏洞，该漏洞源于组件模型相关的主机到wasm跳板实现存在缺陷，可能导致段错误或断言失败。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bytecodealliance | wasmtime | >= 38.0.0, < 38.0.3 | - |
|
II. Public POCs for CVE-2025-62711
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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CVE-2026-104855
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CVE-2026-47261
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CVE-2026-44216
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Same vendor: bytecodealliance
-
CVE-2026-104855
Wasmtime: Preemption and traps during bulk operations enable -
CVE-2026-58494
Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms f -
CVE-2026-54786
Wasmtime: Leak in WASIp1 `fd_renumber` implementation -
CVE-2026-47261
Wasmtime: WASI path_open(TRUNCATE) bypasses `FilePerms::WRIT -
CVE-2026-44216
Wasmtime: Panic when allocating a table exceeding the size o
Same weakness: CWE-755
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V. Comments for CVE-2025-62711
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