UBUNTU-CVE-2026-34945

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Source

https://ubuntu.com/security/CVE-2026-34945

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34945.json

JSON Data

https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-34945

Upstream

CVE-2026-34945

Published

2026-04-09T19:16:00Z

Modified

2026-04-16T09:13:14Z

Severity

2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler contains a bug where a 64-bit table, part of the memory64 proposal of WebAssembly, incorrectly translated the table.size instruction. This bug could lead to disclosing data on the host's stack to WebAssembly guests. The host's stack can possibly contain sensitive data related to other host-originating operations which is not intended to be disclosed to guests. This bug specifically arose from a mistake where the return value of table.size was statically typed as a 32-bit integer, as opposed to consulting the table's index type to see how large the returned register could be. When combined with details about Wnich's ABI, such as multi-value returns, this can be combined to read stack data from the host, within a guest. This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.

References

Affected packages

Ubuntu:24.04:LTS / rust-wasmtime

Package

Name: rust-wasmtime
Purl: pkg:deb/ubuntu/rust-wasmtime@16.0.0+dfsg-3?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

10.*

10.0.1+dfsg-7

15.*

15.0.1+dfsg-4

16.*

16.0.0+dfsg-2

16.0.0+dfsg-3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "librust-cranelift-dev",
            "binary_version": "0.103.0+16.0.0+dfsg-3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34945.json"

Ubuntu:25.10 / rust-wasmtime