DEBIAN-CVE-2026-34946

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Source
https://security-tracker.debian.org/tracker/CVE-2026-34946
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34946.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-34946
Upstream
Published
2026-04-09T19:16:24.490Z
Modified
2026-04-28T20:32:50.528329Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
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 vulnerability where the compilation of the table.fill instruction can result in a host panic. This means that a valid guest can be compiled with Winch, on any architecture, and cause the host to panic. This represents a denial-of-service vulnerability in Wasmtime due to guests being able to trigger a panic. The specific issue is that a historical refactoring changed how compiled code referenced tables within the table.* instructions. This refactoring forgot to update the Winch code paths associated as well, meaning that Winch was using the wrong indexing scheme. Due to the feature support of Winch the only problem that can result is tables being mixed up or nonexistent tables being used, meaning that the guest is limited to panicking the host (using a nonexistent table), or executing spec-incorrect behavior and modifying the wrong table. This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.

References

Affected packages

Debian:13 / rust-wasmtime

Package

Name
rust-wasmtime
Purl
pkg:deb/debian/rust-wasmtime?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

26.*
26.0.1+dfsg-3
26.0.1+dfsg-4
26.0.1+dfsg-5
26.0.1+dfsg-6
26.0.1+dfsg-7
26.0.1+dfsg-8
26.0.1+dfsg-9
26.0.1+dfsg-10
27.*
27.0.0+dfsg-2
27.0.0+dfsg-3
27.0.0+dfsg-4
28.*
28.0.1+dfsg-1
28.0.1+dfsg-2
28.0.1+dfsg-3
29.*
29.0.1+dfsg-1
29.0.1+dfsg-2
29.0.1+dfsg-3
29.0.1+dfsg-4
29.0.1+dfsg-5
29.0.1+dfsg-6
29.0.1+dfsg-7
29.0.1+dfsg-8
36.*
36.0.5+dfsg-1
36.0.5+dfsg-2
36.0.5+dfsg-3
36.0.5+dfsg-4
36.0.5+dfsg-5
36.0.6+dfsg-1
36.0.6+dfsg-2
36.0.6+dfsg-3
36.0.6+dfsg-4
36.0.6+dfsg-5
36.0.6+dfsg-6
36.0.6+dfsg-7
36.0.7+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34946.json"

Debian:14 / rust-wasmtime

Package

Name
rust-wasmtime
Purl
pkg:deb/debian/rust-wasmtime?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
36.0.7+dfsg-1

Affected versions

26.*
26.0.1+dfsg-3
26.0.1+dfsg-4
26.0.1+dfsg-5
26.0.1+dfsg-6
26.0.1+dfsg-7
26.0.1+dfsg-8
26.0.1+dfsg-9
26.0.1+dfsg-10
27.*
27.0.0+dfsg-2
27.0.0+dfsg-3
27.0.0+dfsg-4
28.*
28.0.1+dfsg-1
28.0.1+dfsg-2
28.0.1+dfsg-3
29.*
29.0.1+dfsg-1
29.0.1+dfsg-2
29.0.1+dfsg-3
29.0.1+dfsg-4
29.0.1+dfsg-5
29.0.1+dfsg-6
29.0.1+dfsg-7
29.0.1+dfsg-8
36.*
36.0.5+dfsg-1
36.0.5+dfsg-2
36.0.5+dfsg-3
36.0.5+dfsg-4
36.0.5+dfsg-5
36.0.6+dfsg-1
36.0.6+dfsg-2
36.0.6+dfsg-3
36.0.6+dfsg-4
36.0.6+dfsg-5
36.0.6+dfsg-6
36.0.6+dfsg-7

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34946.json"