CVE-2026-115391
CVE-2026-115391 · Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp3 Streams
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.9 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Affected products and versions
wasmtime
- Versions
- ≥ 46.0.0, < 46.0.3: Affected (semver)
- 46.0.3: Not affected (semver)
- ≥ 47.0.0, < 47.0.4: Affected (semver)
- 47.0.4: Not affected (semver)
Update to 46.0.3; Update to 47.0.4