Wasmtime WASI implementations are vulnerable to guest-controlled resource exhaustion

Impact 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 where a guest can induce a range of...

Panic adding excessive fields to a `wasi:http/types.fields` instance

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h For more information see the GitHub-hosted security advisory...

RUSTSEC-2026-0021 Panic adding excessive fields to a `wasi:http/types.fields` instance

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h For more information see the GitHub-hosted security advisory...

CVE-2026-27204: Uncontrolled Resource Consumption

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...

CVE-2026-27572: Allocation of Resources Without Limits or Throttling

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 the wasi:http/types.fields resource is susceptible to panics when too many fields are added to the set of headers. Wasmtime's implementation in the wasmtime-wasi-http...

MCP-SandboxScan: WASM-Based Secure Execution and Runtime Analysis for MCP Tools

Tool-augmented LLM agents raise new security risks: tool executions can introduce runtime-only behaviors, including prompt injection and unintended exposure of external inputs e.g., environment secrets or local files. While existing scanners often focus on static artifacts, analyzing runtime...

PT-2026-21806

Name of the Vulnerable Software and Affected Versions Wasmtime versions prior to 24.0.6 Wasmtime versions prior to 36.0.6 Wasmtime version 4.0.04 Wasmtime versions prior to 41.0.4 Wasmtime versions prior to 42.0.0 Description Wasmtime's implementation of the wasi:http/types.fields resource is...

EUVD-2024-1924

Malicious code in bioql PyPI...

Exploring and Exploiting the Resource Isolation Attack Surface of WebAssembly Containers

Recently, the WebAssembly or Wasm technology has been rapidly evolving, with many runtimes actively under development, providing cross-platform secure sandboxes for Wasm modules to run as portable containers. Compared with Docker, which isolates applications at the operating system level, Wasm...

Linux Distros Unpatched Vulnerability : CVE-2025-53901

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime's implementation of the WASIp1 set of import functions ca...

CVE-2025-54126: Exposure of Resource to Wrong Sphere

The WebAssembly Micro Runtime's WAMR iwasm package is the executable binary built with WAMR VMcore which supports WebAssembly System Interface WASI and command line interface. In versions 2.4.0 and below, iwasm uses --addr-pool with an IPv4 address that lacks a subnet mask, allowing the system to...

SUSE CVE-2025-53901

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime's implementation of the WASIp1 set of import functions can lead to a WebAssembly guest inducing a panic in the host embedder. The specific bug is triggered by calling pathopen after calling...

UBUNTU-CVE-2025-53901

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime's implementation of the WASIp1 set of import functions can lead to a WebAssembly guest inducing a panic in the host embedder. The specific bug is triggered by calling pathopen after calling...

CVE-2025-53901

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime's implementation of the WASIp1 set of import functions can lead to a WebAssembly guest inducing a panic in the host embedder. The specific bug is triggered by calling "pathopen" after calling...

CVE-2025-53901: Operation on a Resource after Expiration or Release

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime's implementation of the WASIp1 set of import functions can lead to a WebAssembly guest inducing a panic in the host embedder. The specific bug is triggered by calling pathopen after calling...

Malware in wasm-wasi-core

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outsid...

MAL-2025-5067 Malicious code in wasm-wasi-core (npm)

The package communicates with a domain associated with malicious activity. --- -= Per source details. Do not edit below this line.=- Source: ghsa-malware 320ad464f0780881fe134c1e9990c2e1a180a2ab4b6b103e26439d8861709021 Any computer that has this package installed or running should be considered...

Malicious code in wasm-wasi-core (npm)

The package communicates with a domain associated with malicious activity. --- -= Per source details. Do not edit below this line.=- Source: ghsa-malware 320ad464f0780881fe134c1e9990c2e1a180a2ab4b6b103e26439d8861709021 Any computer that has this package installed or running should be considered...

candid-extractor (>=0.1.0, <=0.1.2), purewasm (0.1.0) +12 more potentially affected by CVE-2024-47763 via wasmtime (12.0.2)

wasmtime CARGO version 12.0.2 is affected by a known vulnerability. The following packages have a transitive dependency on wasmtime and may be impacted: - candid-extractor =0.1.0, =12.0.0, =12.0.0, =12.0.0, =0.1.2, =0.3.0, =12.0.0, =12.0.0, =12.0.0, =12.0.0, =12.0.0, =12.0.2 Source cves:...

MAL-2025-1004 Malicious code in wasi8787878 (PyPI)

--- -= Per source details. Do not edit below this line.=- Source: kam193 e7e8dad2dca9000e3bd94355a78838c2c9448aac766722cfd54aba1fc5c2cd43 Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose. --- Category: PROBABLYPENTES...