CVE-2026-115391

Name	CVE-2026-115391
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rust-wasmtime (PTS)	trixie	26.0.1+dfsg-3	fixed
	forky, sid	36.0.13+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rust-wasmtime	source	(unstable)	(not affected)

Notes

- rust-wasmtime <not-affected> (Only affects 46 and later)
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759
https://rustsec.org/advisories/RUSTSEC-2026-0268.html