CVE-2026-115381

MediumCVSS 4.8/10Last modified Oct 26, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770

Affected software

VendorProductVersions
bytecodealliancewasmtime< 36.0.17; >= 37.0.0, < 48.0.4; >= 49.0.0, < 49.0.2

References

Timeline

Published
Oct 22, 2026
Last modified
Oct 26, 2026
NVD status
Deferred

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CVE-2026-115381: Medium severity, CVSS 4.8 | Vulnix