CVE catalog

CVE-2026-34944

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 Cranel

[CVE catalog]

Severity
Medium · CVSS 5CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.23% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
CpewasmtimeNot reported24.0.7fixed
CpewasmtimeNot reported36.0.7fixed
CpewasmtimeNot reported42.0.2fixed
CpewasmtimeNot reported43.0.1fixed
Debianrust-wasmtime1326.0.1+dfsg-10vulnerable
Debianrust-wasmtime1326.0.1+dfsg-3vulnerable
Debianrust-wasmtime1326.0.1+dfsg-4vulnerable
Debianrust-wasmtime1326.0.1+dfsg-5vulnerable
Debianrust-wasmtime1326.0.1+dfsg-6vulnerable
Debianrust-wasmtime1326.0.1+dfsg-7vulnerable
Debianrust-wasmtime1326.0.1+dfsg-8vulnerable
Debianrust-wasmtime1326.0.1+dfsg-9vulnerable
Debianrust-wasmtime1327.0.0+dfsg-2vulnerable
Debianrust-wasmtime1327.0.0+dfsg-3vulnerable
Debianrust-wasmtime1327.0.0+dfsg-4vulnerable
Debianrust-wasmtime1328.0.1+dfsg-1vulnerable
Debianrust-wasmtime1328.0.1+dfsg-2vulnerable
Debianrust-wasmtime1328.0.1+dfsg-3vulnerable
Debianrust-wasmtime1329.0.1+dfsg-1vulnerable
Debianrust-wasmtime1329.0.1+dfsg-2vulnerable
Debianrust-wasmtime1329.0.1+dfsg-3vulnerable
Debianrust-wasmtime1329.0.1+dfsg-4vulnerable
Debianrust-wasmtime1329.0.1+dfsg-5vulnerable
Debianrust-wasmtime1329.0.1+dfsg-6vulnerable
Debianrust-wasmtime1329.0.1+dfsg-7vulnerable
Debianrust-wasmtime1329.0.1+dfsg-8vulnerable
Debianrust-wasmtime1336.0.11+dfsg-1vulnerable
Debianrust-wasmtime1336.0.12+dfsg-1vulnerable
Debianrust-wasmtime1336.0.12+dfsg-2vulnerable
Debianrust-wasmtime1336.0.12+dfsg-3vulnerable
Debianrust-wasmtime1336.0.13+dfsg-1vulnerable
Debianrust-wasmtime1336.0.5+dfsg-1vulnerable
Debianrust-wasmtime1336.0.5+dfsg-2vulnerable
Debianrust-wasmtime1336.0.5+dfsg-3vulnerable
Debianrust-wasmtime1336.0.5+dfsg-4vulnerable
Debianrust-wasmtime1336.0.5+dfsg-5vulnerable
Debianrust-wasmtime1336.0.6+dfsg-1vulnerable
Debianrust-wasmtime1336.0.6+dfsg-2vulnerable
Debianrust-wasmtime1336.0.6+dfsg-3vulnerable
Debianrust-wasmtime1336.0.6+dfsg-4vulnerable
Debianrust-wasmtime1336.0.6+dfsg-5vulnerable
Debianrust-wasmtime1336.0.6+dfsg-6vulnerable
Debianrust-wasmtime1336.0.6+dfsg-7vulnerable
Debianrust-wasmtime1336.0.7+dfsg-1vulnerable
Debianrust-wasmtime1336.0.8+dfsg-1vulnerable
Debianrust-wasmtime1336.0.9+dfsg-1vulnerable
Debianrust-wasmtime1336.0.9+dfsg-2vulnerable
Debianrust-wasmtime1426.0.1+dfsg-10vulnerable
Debianrust-wasmtime1426.0.1+dfsg-3vulnerable
Debianrust-wasmtime1426.0.1+dfsg-4vulnerable
Debianrust-wasmtime1426.0.1+dfsg-5vulnerable
Debianrust-wasmtime1426.0.1+dfsg-6vulnerable
Debianrust-wasmtime1426.0.1+dfsg-7vulnerable
Debianrust-wasmtime1426.0.1+dfsg-8vulnerable
Debianrust-wasmtime1426.0.1+dfsg-9vulnerable
Debianrust-wasmtime1427.0.0+dfsg-2vulnerable
Debianrust-wasmtime1427.0.0+dfsg-3vulnerable
Debianrust-wasmtime1427.0.0+dfsg-4vulnerable
Debianrust-wasmtime1428.0.1+dfsg-1vulnerable
Debianrust-wasmtime1428.0.1+dfsg-2vulnerable
Debianrust-wasmtime1428.0.1+dfsg-3vulnerable
Debianrust-wasmtime1429.0.1+dfsg-1vulnerable
Debianrust-wasmtime1429.0.1+dfsg-2vulnerable
Debianrust-wasmtime1429.0.1+dfsg-3vulnerable
Debianrust-wasmtime1429.0.1+dfsg-4vulnerable
Debianrust-wasmtime1429.0.1+dfsg-5vulnerable
Debianrust-wasmtime1429.0.1+dfsg-6vulnerable
Debianrust-wasmtime1429.0.1+dfsg-7vulnerable
Debianrust-wasmtime1429.0.1+dfsg-8vulnerable
Debianrust-wasmtime1436.0.5+dfsg-1vulnerable
Debianrust-wasmtime1436.0.5+dfsg-2vulnerable
Debianrust-wasmtime1436.0.5+dfsg-3vulnerable
Debianrust-wasmtime1436.0.5+dfsg-4vulnerable
Debianrust-wasmtime1436.0.5+dfsg-5vulnerable
Debianrust-wasmtime1436.0.6+dfsg-1vulnerable
Debianrust-wasmtime1436.0.6+dfsg-2vulnerable
Debianrust-wasmtime1436.0.6+dfsg-3vulnerable
Debianrust-wasmtime1436.0.6+dfsg-4vulnerable
Debianrust-wasmtime1436.0.6+dfsg-5vulnerable
Debianrust-wasmtime1436.0.6+dfsg-6vulnerable
Debianrust-wasmtime1436.0.6+dfsg-7vulnerable
Debianrust-wasmtime1436.0.7+dfsg-1fixed
CpewasmtimeNot reported43.0.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
CpewasmtimecpeNot reported24.0.7Not reportedNot reportedNot reported
CpewasmtimecpeNot reported36.0.7Not reportedNot reportedNot reported
CpewasmtimecpeNot reported42.0.2Not reportedNot reportedNot reported
CpewasmtimecpeNot reported43.0.1Not reportedNot reportedNot reported
Debianrust-wasmtimedeb1436.0.7+dfsg-1Not reportedDEBIAN-CVE-2026-34944Not reported
CpewasmtimecpeNot reported43.0.1Not reportedNVD-CVE-2026-34944Not reported

OpenFactory catalog packages

[Debian 13 (Trixie)]

  • [librust-cranelift-dev]Affected

    Source package: [rust-wasmtime]

    Details (2)

    • 0.113.1+26.0.1+dfsg-3 · all · trixie

      Affected

      nvd · rust-wasmtime · debian · 13

    • 0.113.1+26.0.1+dfsg-3 · all · trixie

      Affected

      nvd · rust-wasmtime · debian · 13

Observed:

References

[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]