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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation

Fix availableCritical · CVSS 9.9

Published Oct 23, 2026 · updated Oct 23, 2026

What to do

  1. Upgrade to a fixed version: wasmtime 36.0.19, wasmtime 43.0.0.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

crates.iowasmtime

Vulnerable versions
< 36.0.19
Fixed in
36.0.19

Check your project: cargo tree -i wasmtime

crates.iowasmtime

Vulnerable versions
>= 37.0.0, < 43.0.0
Fixed in
43.0.0

Check your project: cargo tree -i wasmtime

What changed

  1. Oct 23, 2026

    Published in the GitHub Advisory Database as critical.

Sources

CWE-197 Numeric Truncation Error · CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

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