CVE-2026-115391
Medium
Description
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.
SeverityMedium
CVSS5.8
Exploit probability—
ProductBytecodealliance Wasmtime
PublishedOct 22, 2026
First seenOct 22, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- bytecodealliance wasmtime46.0.3, 47.0.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bytecodealliance wasmtime | 46.0.0 ≤ v < 46.0.3, 47.0.0 ≤ v < 47.0.4 | 46.0.3, 47.0.4 |
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