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Wasmtime miscompiled guest heap access enables sandbox escape on aarch64 Cranelift

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

8 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

1 Nov 2026 06:07:53 UTC

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address …

euvd · EUVD-2026-21027 · Published

30 Oct 2026 05:52:00 UTC

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address …

euvd · EUVD-2026-21027 · Published

28 Oct 2026 04:54:14 UTC

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address …

euvd · EUVD-2026-21027 · Published

27 Oct 2026 09:03:08 UTC

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address …

nvd · CVE-2026-34971 · Published

25 Oct 2026 08:17:35 UTC

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address …

nvd · CVE-2026-34971 · Published

24 Oct 2026 13:19:54 UTC

Wasmtime: Miscompiled guest heap access enables sandbox escape on aarch64 Cranelift

osv · GHSA-jhxm-h53p-jm7w · Published

24 Oct 2026 13:19:54 UTC

Miscompiled guest heap access enables sandbox escape on aarch64 Cranelift

osv · RUSTSEC-2026-0096 · Published

23 Oct 2026 15:48:27 UTC

Wasmtime miscompiled guest heap access enables sandbox escape on aarch64 Cranelift

cve-program · CVE-2026-34971 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 1 Nov 13:03 UTC · 275 of 275 readable · 270 fully read · documentation 469/469 current