GHSA-mghf-wjfp-p5xm

Source

https://github.com/advisories/GHSA-mghf-wjfp-p5xm

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mghf-wjfp-p5xm/GHSA-mghf-wjfp-p5xm.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-mghf-wjfp-p5xm

Aliases

Downstream

CGA (5)

Published

2026-10-28T21:14:14Z

Modified

2026-10-28T21:30:05Z

Severity

9.9 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator

Summary

Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction

Details

Summary

When running with the Cranelift compiler backend on an aarch64 target, Wasmtime can compile a Wasm module with more than ~256k targets on one br_table instruction in a way that results in an incorrect conditional branch target. This conditional branch could then jump to arbitrary other code (at an user-controlled offset), leading to arbitrary sandbox escapes.

Impact

Any Wasmtime engine running on aarch64 with default settings can be forced to jump to arbitrary code by a user-controlled Wasm module. All versions of Wasmtime/Cranelift that support aarch64, since the initial release of that support in 2020 (before Wasmtime v1.0), are affected.

Patches

Wasmtime v36.0.19, v48.0.7, and v49.0.4 have been released which all fix this issue.

Database specific

{
    "cwe_ids":  [
        "CWE-691"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-28T21:14:14Z",
    "nvd_published_at":  "2026-10-23T22:16:58Z",
    "severity":  "CRITICAL"
}

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

0 Unknown introduced version / All previous versions are affected

Fixed

36.0.19

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mghf-wjfp-p5xm/GHSA-mghf-wjfp-p5xm.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

48.0.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mghf-wjfp-p5xm/GHSA-mghf-wjfp-p5xm.json"

crates.io / wasmtime

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

49.0.0

Fixed

49.0.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mghf-wjfp-p5xm/GHSA-mghf-wjfp-p5xm.json"