CVE catalog

CVE-2026-34983

Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be trigg

[CVE catalog]

Severity
Low · CVSS 2.5CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Published
Source
[NVD] · [CVE record]
EPSS
0.12% · Oct 25, 2026

Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 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 reportedNot reportedunknown
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 reportedNot reportedunknown

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianrust-wasmtimedeb1436.0.7+dfsg-1Not reportedDEBIAN-CVE-2026-34983Not 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]