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CVE-2026-44216

5.9 medium SSVC exploitation: none Modified
NVD · CVE.org

Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables can have sizes in the 64-bit range as opposed to the previous 32-bit range which would not overflow. The panic happens when attempting to create a very large table, such as when instantiating a WebAssembly module or component. This vulnerability is fixed in 36.0.8, 43.0.2, and 44.0.1.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.9 · bytecodeallianceNVD modified 2026-10-26 14:10

Affected (CPE criteria) 2

  • cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
  • cpe:2.3:a:bytecodealliance:wasmtime:44.0.0:*:*:*:*:rust:*:*

References 5