CVE-2026-119134
Medium
Description
Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 caps component-model resource handle tables only per component instance and does not charge handle allocations to any ResourceLimiter or StoreLimits. A malicious guest can repeatedly call resource.new and instantiate sub-components to exceed the per-instance cap many times over, causing unbounded host memory growth.
SeverityMedium
CVSS6.2
Exploit probability—
ProductBytecodealliance Wasmtime
PublishedOct 29, 2026
First seenNov 4, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- bytecodealliance wasmtime36.0.18, 48.0.6, 49.0.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bytecodealliance wasmtime | v < 36.0.18, 37.0.0 ≤ v < 48.0.6, 49.0.0 ≤ v < 49.0.3 | 36.0.18, 48.0.6, 49.0.3 |
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