RUSTSEC-2026-0268 Guest controlled-size host heap allocation through WASIp3 streams

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759 For more information see the GitHub-hosted security advisory...

wasmtime:wast_tests: Stack-buffer-overflow in <wasmtime::runtime::store::StoreOpaque>::allocate_continuation

Project: https://github.com/bytecodealliance/wasmtime.git Detailed Report: https://oss-fuzz.com/testcase?key=6455086528921600 Project: wasmtime Fuzzing Engine: libFuzzer Fuzz Target: wasttests Job Type: libfuzzerasanwasmtime Platform Id: linux Crash Type: Stack-buffer-overflow WRITE Crash Address...

wasmtime:wast_tests: Stack-use-after-scope in wast_tests

Project: https://github.com/bytecodealliance/wasmtime.git Detailed Report: https://oss-fuzz.com/testcase?key=5408661569339392 Project: wasmtime Fuzzing Engine: libFuzzer Fuzz Target: wasttests Job Type: libfuzzerasanwasmtime Platform Id: linux Crash Type: Stack-use-after-scope WRITE 7 Crash...

GO-2025-3678 vulnerabilities

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

RUSTSEC-2026-0222 Stores can mix up type indices between engines

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hgjw-h833-99q9 For more information see the GitHub-hosted security advisory...

RUSTSEC-2026-0223 Preemption and traps during bulk operations enable breaking internal VM state

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2hw9-mc66-jc2q For more information see the GitHub-hosted security advisory...

Preemption and traps during bulk operations enable breaking internal VM state

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2hw9-mc66-jc2q For more information see the GitHub-hosted security advisory...

Stores can mix up type indices between engines

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hgjw-h833-99q9 For more information see the GitHub-hosted security advisory...

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...

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...

EUVD-2025-33183

Wasmtime: Memory leak in C API with externref and anyref types...

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...

SUSE 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...

wasmtime: Wasmtime: Overwrite host files via insufficient permission checks in wasmtime-wasi

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...

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...

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...

SUSE 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...