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Advisories

Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Misaligned VMContext via Exception Tags

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Severity
low
Date
Affecting

  • wasmtime >= 47.0.0, < 48.0.6

  • wasmtime >= 49.0.0, < 49.0.3

CWE
  • CWE-758 Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
CVSS
2.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Description
Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a memory misalignment flaw in VMContext layout that causes undefined behavior when modules contain an odd number of exception tags. A WebAssembly module with an odd tag count misaligns subsequent host fields in embedders with exceptions enabled, although no exploitation path is currently known.

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