Critical Wasmtime Runtime Flaws Allow WebAssembly Sandbox Escape on ARM64
Two critical vulnerabilities in the Wasmtime WebAssembly runtime could enable sandbox escape, especially on ARM64 builds. The flaws underscore the importance of mapping sandbox isolation controls to audit frameworks for continuous assurance.
ADTP Breach Watch· October 26, 2026· The Hacker News
SeverityCritical
Type☁️ Advisory
ConfidenceHigh
ReportedOct 26, 2026
Technology & SaaSTechnology SaaS providersCloud infrastructure teams embedding WasmtimeVulnerability Exploit
What happened
The Wasmtime project disclosed two critical flaws that allow a malicious WebAssembly module to break out of the sandbox designed to contain it. Exploitation requires a vulnerable Wasmtime build to compile the malicious module; one of the bugs is limited to ARM64 binaries. The maintainers issued patched versions and recommended immediate upgrades.
Why it matters for trust and compliance
This incident demonstrates why organizations must continuously map runtime isolation controls to their audit frameworks and retain verifiable evidence of remediation.
Map sandbox isolation controls to your framework of record and collect version‑verification evidence.
Use continuous monitoring to detect unpatched runtime libraries across your software supply chain.
Who is affected
Technology SaaS providersCloud infrastructure teams embedding Wasmtime
Recommended actions
Identify all deployments using Wasmtime and verify they run the patched version.
Update to the latest releases and document the change as compliance evidence.
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