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CVE-2026-27204— Wasmtime WASI implementations are vulnerable to guest-controlled resource exhaustion

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 24.0.6之前版本、36.0.6之前版本、4.0.04之前版本、41.0.4之前版本和42.0.0之前版本存在安全漏洞，该漏洞源于WASI主机接口未对客机请求的资源分配施加适当限制，可能导致拒绝服务攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-27204

Vulnerability Information
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Vulnerability Title
Wasmtime WASI implementations are vulnerable to guest-controlled resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not appropriately place limits on resource allocations requested by the guests. This serves as a Denial of Service vector. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 have all been released with the fix for this issue. These versions do not prevent this issue in their default configuration to avoid breaking preexisting behaviors. All versions of Wasmtime have appropriate knobs to prevent this behavior, and Wasmtime 42.0.0-and-later will have these knobs tuned by default to prevent this issue from happening. There are no known workarounds for this issue without upgrading. Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
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 24.0.6之前版本、36.0.6之前版本、4.0.04之前版本、41.0.4之前版本和42.0.0之前版本存在安全漏洞，该漏洞源于WASI主机接口未对客机请求的资源分配施加适当限制，可能导致拒绝服务攻击。
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 < 24.0.6 -

II. Public POCs for CVE-2026-27204

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III. Intelligence Information for CVE-2026-27204

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Vendor Pages for CVE-2026-27204 (2)

Same Patch Batch · bytecodealliance · 2026-02-24 · 3 CVEs total

CVE-2026-27195 Wasmtime is vulnerable to panic when dropping a `[Typed]Func::call_async` future
CVE-2026-27572 Wasmtime can panic when adding excessive fields to a `wasi:http/types.fields` instance

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-400

V. Comments for CVE-2026-27204

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