CVE-2026-115387

Medium

Description

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 contains a denial of service vulnerability in wasmtime-wasi that allows guest WASI programs to panic the host via overflowing filesystem timestamps. Attackers can pass atim or mtim values whose sub-second field overflows the seconds field to path_filestat_set_times, fd_filestat_set_times, set-times, or set-times-at, crashing the host.

SeverityMedium

CVSS6.2

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-190Integer overflow

How to fix

Update

bytecodealliance wasmtime36.0.16, 48.0.3, 49.0.1 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-j2g9-4prp-pf6h

Affected products

Product	Affected versions	Fixed in
bytecodealliance wasmtime	v < 36.0.16, 37.0.0 ≤ v < 48.0.3, 49.0.0 ≤ v < 49.0.1	36.0.16, 48.0.3, 49.0.1

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