Cloudanix VulnDB

CVE-2025-64345

Low · 1.8

CVSS

1.8

EPSS

0.1%

Published

Nov 12, 2025

CISA due date

—

The record

Wasmtime is a runtime for WebAssembly. Prior to version 38.0.4, 37.0.3, 36.0.3, and 24.0.5, Wasmtime's Rust embedder API contains an unsound interaction where a WebAssembly shared linear memory could be viewed as a type which provides safe access to the host (Rust) to the contents of the linear memory. This is not sound for shared linear memories, which could be modified in parallel, and this could lead to a data race in the host. Patch releases have been issued for all supported versions of Wasmtime, notably: 24.0.5, 36.0.3, 37.0.3, and 38.0.4. These releases reject creation of shared memories via `Memory::new` and shared memories are now excluded from core dumps. As a workaround, eembeddings affected by this issue should use `SharedMemory::new` instead of `Memory::new` to create shared memories. Affected embeddings should also disable core dumps if they are unable to upgrade. Note that core dumps are disabled by default but the wasm threads proposal (and shared memory) is enabled by default.

Affected packages

Ecosystem Package Introduced Fixed
crates.io wasmtime 0 24.0.5
crates.io wasmtime 0.0.0-0 24.0.5
crates.io wasmtime 26.0.0 36.0.3
crates.io wasmtime 37.0.0 37.0.3
crates.io wasmtime 38.0.0 38.0.4
Chainguard wasmcloud 0 1.9.1-r0
Chainguard wizer 0 10.0.0-r3
Chainguard yara-x 0 1.9.0-r2
Chainguard yara-x-compat 0 1.9.0-r2
Chainguard zellij 0 0.44.0-r0
Chainguard zellij-bash-completion 0 0.43.1-r1
Chainguard zellij-fish-completion 0 0.43.1-r1
Chainguard zellij-zsh-completion 0 0.43.1-r1
Wolfi wasmcloud 0 1.9.1-r0
Wolfi wizer 0 10.0.0-r3
Wolfi yara-x 0 1.9.0-r2
Wolfi yara-x-compat 0 1.9.0-r2
Wolfi zellij 0 0.44.0-r0
Wolfi zellij-bash-completion 0 0.43.1-r1
Wolfi zellij-fish-completion 0 0.43.1-r1
Wolfi zellij-zsh-completion 0 0.43.1-r1
cargo wasmtime 26.0.0 36.0.3
cargo wasmtime 37.0.0 37.0.3
cargo wasmtime 38.0.0 38.0.4

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