EUVD-2025-131930Published

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 …

Exact source revision recorded 1 Nov 2026 01:12:51 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2025-131930

Published

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.

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datePublished: Nov 12, 2025, 9:25:50 PM

dateUpdated: Nov 12, 2025, 9:40:37 PM

Source published: Nov 12, 2025, 9:25:50 PM (timezone not stated)
Source modified: Nov 12, 2025, 9:40:37 PM (timezone not stated)
Observed here: 1 Nov 2026 01:12:51 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 1.8 CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N