CVE-2026-115381
Medium
Description
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an unbounded memory allocation in the wasmtime-wasi WASIp2 write-zeroes method of SinkOutputStream, the default stream used when stdout/stderr are not configured. A malicious WebAssembly guest can request huge zero-filled writes, exhausting host memory and causing denial of service.
SeverityMedium
CVSS4.8
Exploit probability—
ProductBytecodealliance Wasmtime
PublishedOct 22, 2026
First seenOct 22, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- bytecodealliance wasmtime36.0.17, 48.0.4, 49.0.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bytecodealliance wasmtime | v < 36.0.17, 37.0.0 ≤ v < 48.0.4, 49.0.0 ≤ v < 49.0.2 | 36.0.17, 48.0.4, 49.0.2 |
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