Threat Pulse 62High
Two Wasmtime flaws (CVSS 9.9) let WebAssembly escape the sandbox
Severity 7PatchedconfirmedCloud and SaaSWeb servers and gateways

CVE-2026-115889 (multiple architectures) and CVE-2026-115893 (ARM64, present since 2020) in the Cranelift compiler let malicious WebAssembly modules escape Wasmtime's sandbox. Apps that embed Wasmtime need rebuilding.

What to do: Update Wasmtime and rebuild anything that embeds it.

· 10 days ago · The Hacker News on X
SourcesThe Hacker News on X
On X
@TheHackersNewsverifiedOct 26, 11:56 UTC

2 New critical Wasmtime flaws (CVSS 9.9) could let malicious WebAssembly modules escape their sandbox. CVE-2026-115889 affects multiple architectures; CVE-2026-115893 ARM64-only, present since 2020. Embedded apps need rebuilding.

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Plan rubric with caps (verified sweep, Oct 26)

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Updated Nov 5, 01:46 UTC. Refreshes on its own.

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