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CVE-2026-115381

CVE-2026-115381 · Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Unbounded Host Memory Allocation via SinkOutputStream write-zeroes

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

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.

CVSS 5.9 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • wasmtime

    Versions
    • ≥ 0, < 36.0.17: Affected (semver)
    • 36.0.17: Not affected (semver)
    • ≥ 37.0.0, < 48.0.4: Affected (semver)
    • 48.0.4: Not affected (semver)
    • ≥ 49.0.0, < 49.0.2: Affected (semver)
    • 49.0.2: Not affected (semver)

    Update to 36.0.17; Update to 48.0.4; Update to 49.0.2

  • rust-wasmtime Debian:13

    Versions
    • 26.0.1+dfsg-10
    • 26.0.1+dfsg-3
    • 26.0.1+dfsg-4
    • 26.0.1+dfsg-5
    • 26.0.1+dfsg-6
    • 26.0.1+dfsg-7
    • 26.0.1+dfsg-8
    • 26.0.1+dfsg-9
    • 27.0.0+dfsg-2
    • 27.0.0+dfsg-3
    • 27.0.0+dfsg-4
    • 28.0.1+dfsg-1
    • 28.0.1+dfsg-2
    • 28.0.1+dfsg-3
    • 29.0.1+dfsg-1
    • 29.0.1+dfsg-2
    • 29.0.1+dfsg-3
    • 29.0.1+dfsg-4
    • 29.0.1+dfsg-5
    • 29.0.1+dfsg-6
    • 29.0.1+dfsg-7
    • 29.0.1+dfsg-8
    • 36.0.11+dfsg-1
    • 36.0.12+dfsg-1
    • 36.0.12+dfsg-2
    • 36.0.12+dfsg-3
    • 36.0.13+dfsg-1
    • 36.0.5+dfsg-1
    • 36.0.5+dfsg-2
    • 36.0.5+dfsg-3
    • 36.0.5+dfsg-4
    • 36.0.5+dfsg-5
    • 36.0.6+dfsg-1
    • 36.0.6+dfsg-2
    • 36.0.6+dfsg-3
    • 36.0.6+dfsg-4
    • 36.0.6+dfsg-5
    • 36.0.6+dfsg-6
    • 36.0.6+dfsg-7
    • 36.0.7+dfsg-1
    • 36.0.8+dfsg-1
    • 36.0.9+dfsg-1
    • 36.0.9+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rust-wasmtime Debian:14

    Versions
    • 26.0.1+dfsg-10
    • 26.0.1+dfsg-3
    • 26.0.1+dfsg-4
    • 26.0.1+dfsg-5
    • 26.0.1+dfsg-6
    • 26.0.1+dfsg-7
    • 26.0.1+dfsg-8
    • 26.0.1+dfsg-9
    • 27.0.0+dfsg-2
    • 27.0.0+dfsg-3
    • 27.0.0+dfsg-4
    • 28.0.1+dfsg-1
    • 28.0.1+dfsg-2
    • 28.0.1+dfsg-3
    • 29.0.1+dfsg-1
    • 29.0.1+dfsg-2
    • 29.0.1+dfsg-3
    • 29.0.1+dfsg-4
    • 29.0.1+dfsg-5
    • 29.0.1+dfsg-6
    • 29.0.1+dfsg-7
    • 29.0.1+dfsg-8
    • 36.0.11+dfsg-1
    • 36.0.12+dfsg-1
    • 36.0.12+dfsg-2
    • 36.0.12+dfsg-3
    • 36.0.13+dfsg-1
    • 36.0.5+dfsg-1
    • 36.0.5+dfsg-2
    • 36.0.5+dfsg-3
    • 36.0.5+dfsg-4
    • 36.0.5+dfsg-5
    • 36.0.6+dfsg-1
    • 36.0.6+dfsg-2
    • 36.0.6+dfsg-3
    • 36.0.6+dfsg-4
    • 36.0.6+dfsg-5
    • 36.0.6+dfsg-6
    • 36.0.6+dfsg-7
    • 36.0.7+dfsg-1
    • 36.0.8+dfsg-1
    • 36.0.9+dfsg-1
    • 36.0.9+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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