CVE-2026-115384: wasmtime 39.0.0 to before 48.0.4, 49.0.0 to before 49.0.2

Affected technology

wasmtime · 39.0.0 to before 48.0.4, 49.0.0 to before 49.0.2
bytecodealliance

Description’s affected range: before 48.0.4 and 49.0.0 before 49.0.2

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox. Vendor/CNA’s CVSS 4.0 assessment (base score 9.4/10) rates confidentiality, integrity and availability impact as high.