GHSA-q49f-xg75-m9xw

Source

https://github.com/advisories/GHSA-q49f-xg75-m9xw

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q49f-xg75-m9xw/GHSA-q49f-xg75-m9xw.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-q49f-xg75-m9xw

Aliases

Downstream

CGA (10)

JLSEC (1)

JLSEC-2026-1359

Published

2026-04-09T20:23:21Z

Modified

2026-09-10T03:51:02Z

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
5.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Wasmtime has host panic when Winch compiler executes `table.fill`

Details

Impact

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, #11254, 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.

Patches

Wasmtime 36.0.7, 42.0.2, and 43.0.1 have been issued to fix this bug. Users are recommended to update to these patched versions of Wasmtime.

Workarounds

Users of Cranelift are not affected by this issue, but for users of Winch there is no workaround for this bug. Hosts are recommended to updated to a patched version of Wasmtime.

Database specific

{
    "cwe_ids":  [
        "CWE-248",
        "CWE-670"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-04-09T20:23:21Z",
    "nvd_published_at":  "2026-04-09T19:16:24Z",
    "severity":  "MODERATE"
}

References

Affected packages

crates.io / wasmtime

Package

Name: wasmtime; View open source insights on deps.dev
Purl: pkg:cargo/wasmtime

Affected ranges

Type: SEMVER
Events: Introduced

25.0.0

Fixed

36.0.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q49f-xg75-m9xw/GHSA-q49f-xg75-m9xw.json"

crates.io / wasmtime

Package

Name: wasmtime; View open source insights on deps.dev
Purl: pkg:cargo/wasmtime

Affected ranges

Type: SEMVER
Events: Introduced

37.0.0

Fixed

42.0.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q49f-xg75-m9xw/GHSA-q49f-xg75-m9xw.json"

crates.io / wasmtime

Package

Name: wasmtime; View open source insights on deps.dev
Purl: pkg:cargo/wasmtime

Affected ranges

Type: SEMVER
Events: Introduced

43.0.0

Fixed

43.0.1

Affected versions

43.*

43.0.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q49f-xg75-m9xw/GHSA-q49f-xg75-m9xw.json"