CVE-2026-115388

MediumCVSS 6.2/10Last modified Oct 29, 2026

Description

wasmtime-wasi-http in Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not enforce the wasi:io/streams check-write allowance for WASIp2 outgoing HTTP bodies, so oversized writes succeed instead of trapping. A malicious guest can pass large buffers to write on outgoing-body resources, holding host allocations for the store's lifetime and exhausting host memory.

Metrics

CVSS 3.1 6.2/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
bytecodealliance	wasmtime	< 36.0.16; >= 37.0.0, < 48.0.3; >= 49.0.0, < 49.0.1

References

Timeline

Published: Oct 22, 2026
Last modified: Oct 29, 2026
NVD status: Deferred

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