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Advisories

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

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Severity
medium
Date
Affecting

  • wasmtime >= 0, < 36.0.17

  • wasmtime >= 37.0.0, < 48.0.4

  • wasmtime >= 49.0.0, < 49.0.2

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
5.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
smaeljaish771, KeenSecurityLab
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.

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