| Name | CVE-2026-34944 |
| Description | Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1. |
| 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) |
| Debian Bugs | 1133839 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| rust-wasmtime (PTS) | trixie | 26.0.1+dfsg-3 | vulnerable |
| sid, forky | 36.0.7+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) | 36.0.7+dfsg-1 | 1133839 |
[trixie] - rust-wasmtime <no-dsa> (Minor issue)
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv
https://rustsec.org/advisories/RUSTSEC-2026-0087.html