CVE-2026-115386: Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd_readdir…

PriorityP412low2.6CVSS 3.1

AVNACHPRLUIRSUCLINAN

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd_readdir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of leftover host stack or heap memory per directory entry.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
bytecodealliance	wasmtime	< 36.0.17	36.0.17
bytecodealliance	wasmtime	>= 37.0.0 < 48.0.4	48.0.4
bytecodealliance	wasmtime	>= 49.0.0 < 49.0.2	49.0.2

CVSS provenance

nvdv3.12.6LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

nvdv4.02.1LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:N/VA:N/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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