CVE-2026-115391: Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers…

PriorityP424medium5.8CVSS 3.1

AVNACHPRLUIRSCCNINAH

Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
bytecodealliance	wasmtime	>= 46.0.0 < 46.0.3	46.0.3
bytecodealliance	wasmtime	>= 47.0.0 < 47.0.4	47.0.4

CVSS provenance

nvdv3.15.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H

nvdv4.06.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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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