CVE-2026-115383: Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains an improper validation vulnerability that accepts components whose core modules import…

PriorityP420medium4.8CVSS 3.1

AVNACHPRLUIRSUCNINAH

Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains an improper validation vulnerability that accepts components whose core modules import WebAssembly tags with a subtype of the original type. Malicious guests can mis-type exception object payloads to corrupt the GC heap, causing Wasmtime to panic when the exceptions proposal is enabled.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
bytecodealliance	wasmtime	>= 47.0.0 < 48.0.4	48.0.4
bytecodealliance	wasmtime	>= 49.0.0 < 49.0.2	49.0.2

CVSS provenance

nvdv3.14.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

nvdv4.05.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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