EUVD-2026-41136

Wasmtime has a leak in WASIp1 fdrenumber implementation...

Wasmtime has a leak in WASIp1 `fd_renumber` implementation

Impact Wasmtime's native implementation of WASIp1 suffers from a leak in the fdrenumber function where the file descriptor being renumbered to is not properly closed. Wasmtime's implementation erroneously only updated the table of descriptors for WASIp1 and didn't update the underlying table of...

GO-2025-3678 vulnerabilities

Vulnerabilities for packages: wash, shadowsocks-rust, nushell, rye, uv, parseable, zola, wasm-pack, sqlx, zed, rustup, cargo-audit, linkerd-extension-init, sccache, samply, zizmor, sdp-k8s-injector, buck2, xh, deno, pixi, kdash, wadm, tealdeer, rustls-ffi, linkerd2-proxy, qdrant, oranda, wasmtime...

CLEANSTART-2026-VU15180 Security fixes in wasmtime 40.0.0-r0

Package wasmtime version 40.0.0-r0 fixes 3 vulnerabilities: CVE-2026-25541, ghsa-434x-w66g-qw3r, ghsa-cq8v-f236-94qc...

wasmtime: Wasmtime: Denial of Service via large WebAssembly table allocation

A flaw was found in Wasmtime, a runtime for WebAssembly. A remote attacker could exploit an arithmetic overflow vulnerability by instantiating a WebAssembly module or component that attempts to allocate an extremely large table using the WebAssembly memory64 proposal. This flaw causes Wasmtime to...

CLEANSTART-2026-BK22414 Security fixes for CVE-2026-25541, ghsa-434x-w66g-qw3r, ghsa-cq8v-f236-94qc applied in versions: 40.0.0-r0

Multiple security vulnerabilities affect the wasmtime package. These issues are resolved in later releases. See references for individual vulnerability details...

GHSA-VVP9-H8P2-XWFC Wasmtime: Memory leak in C API with `externref` and `anyref` types

Impact Wasmtime 37.0.0 and 37.0.1 have memory leaks in the C/C++ API when using bindings for the anyref or externref WebAssembly values. This is caused by a regression introduced during the development of 37.0.0 and all prior versions of Wasmtime are unaffected. If anyref or externref is not used...

CVE-2026-47261

A flaw was found in Wasmtime, a runtime for WebAssembly. This vulnerability allows an attacker to bypass intended access controls when a filesystem preopen is configured with read-only file permissions but also allows directory mutations. By using specific open flags, an attacker can truncate fil...

CVE-2026-58494

A flaw was found in Wasmtime, a runtime for WebAssembly. A WebAssembly System Interface WASI guest with a read-only source file capability can exploit this vulnerability. During hard-link creation and renaming operations, the system checks directory permissions but fails to match file permissions...

Linux Distros Unpatched Vulnerability : CVE-2026-58494

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 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard- link creation and renaming check directory permissions...

CVE-2026-58494

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite...

DEBIAN-CVE-2026-58494

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite...

UBUNTU-CVE-2026-58494

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite...

CVE-2026-58494 Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite...

CVE-2026-58494

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite...

CVE-2026-58494 Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite...

CVE-2026-58494

CVE-2026-58494 affects Wasmtime runtimes prior to the fixed versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1. The issue arises in wasmtime-wasi where hard-link creation and renaming check directory permissions do not correctly match FilePerms on source and destination preopens. This can allow a WASI...

CVE-2026-54786

A flaw was found in Wasmtime, a runtime for WebAssembly. Its native implementation of WASIp1, a system interface for WebAssembly, contains a resource leak in the fdrenumber function. A malicious guest program can repeatedly call this function, causing the host system to exhaust its file descripto...

Linux Distros Unpatched Vulnerability : CVE-2026-54786

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. All versions prior to 24.0.10; versions 25.0.0 through those before 36.0.11; versions 37.0.0 through those before 44.0.3;...

DEBIAN-CVE-2026-54786

Wasmtime is a runtime for WebAssembly. All versions prior to 24.0.10; versions 25.0.0 through those before 36.0.11; versions 37.0.0 through those before 44.0.3; and versions 45.0.0 and 45.0.1 contain a native implementation of WASIp1 which suffers from a leak in the fdrenumber function where the...