CVE-2026-34987Published

Wasmtime with Winch compiler backend on aarch64 may allow a sandbox-escaping memory access

cve-program · CVE-2026-34987

Published

wasmtime

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "bytecodealliance",
                    "product": "wasmtime",
                    "versions": [
                        {
                            "version": ">= 25.0.0, < 36.0.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 37.0.0, < 42.0.2",
                            "status": "affected"
                        },
                        {
                            "version": ">= 43.0.0, < 44.0.1",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-21031

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Apr 9, 2026, 6:48:33 PM

dateUpdated: Apr 10, 2026, 2:12:55 PM

2 related source bulletins · separate from aliases

SUSE-SU-2026:21789-1: Security update for tree-sitter

CVE-2026-34941 · CVE-2026-34942 · CVE-2026-34943 · CVE-2026-34944 · CVE-2026-34945 · CVE-2026-34946 · CVE-2026-34987 · CVE-2026-34988 · CVE-2026-35186 · CVE-2026-35195

openSUSE-SU-2026:20749-1: Security update for tree-sitter

CVE-2026-34941 · CVE-2026-34942 · CVE-2026-34943 · CVE-2026-34944 · CVE-2026-34945 · CVE-2026-34946 · CVE-2026-34987 · CVE-2026-34988 · CVE-2026-35186 · CVE-2026-35195

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-34987

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-125 · CWE-787

Original publisher date fields

published: 2026-04-09T19:16:25.000

lastModified: 2026-10-26T22:10:00.163

2 source CPE criteria · context only

cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
cpe:2.3:a:bytecodealliance:wasmtime:43.0.0:*:*:*:*:rust:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-xx5w-cvp6-jv83

Published

wasmtime

crates.io

SEMVER · introduced 25.0.0 → fixed 36.0.7

wasmtime

crates.io

SEMVER · introduced 37.0.0 → fixed 42.0.2

wasmtime

crates.io

SEMVER · introduced 43.0.0 → fixed 43.0.1

1 explicitly affected versions

43.0.0

Original source record · Cite this exact observation · Complete original publisher JSON

osv · RUSTSEC-2026-0095

Published

wasmtime

crates.io

SEMVER · introduced 0.0.0-0 → fixed 36.0.7 → introduced 37.0.0 → fixed 42.0.2 → introduced 43.0.0 → fixed 43.0.1

Original source record · Cite this exact observation · Complete original publisher JSON