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Advisories

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service via Val API

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Severity
low
Date
Affecting

  • wasmtime >= 0, < 36.0.16

  • wasmtime >= 37.0.0, < 48.0.3

  • wasmtime >= 49.0.0, < 49.0.1

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
1.0
CVSS V4 Vector
CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
wilfreddenton
Description
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.

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