CVE-2026-115389
Low · 2.3CVSS
2.3
EPSS
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Published
Oct 22, 2026
CISA due date
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The record
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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