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CVE-2026-115388

CVE-2026-115388 · Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion DoS via wasmtime-wasi-http Outgoing Body Write

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.9 · Medium · EPSS 0.1% · Fix available

Published
Updated

Affected products and versions

  • wasmtime

    Versions
    • ≥ 0, < 36.0.16: Affected (semver)
    • 36.0.16: Not affected (semver)
    • ≥ 37.0.0, < 48.0.3: Affected (semver)
    • 48.0.3: Not affected (semver)
    • ≥ 49.0.0, < 49.0.1: Affected (semver)
    • 49.0.1: Not affected (semver)

    Update to 36.0.16; Update to 48.0.3; Update to 49.0.1

Original sources

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