CVE-2026-34944

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Source
https://cve.org/CVERecord?id=CVE-2026-34944
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-34944.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-34944
Aliases
Downstream
Related
Published
2026-04-09T18:38:16.182Z
Modified
2026-04-22T05:14:13.951509981Z
Severity
  • 4.1 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Wasmtime segfault or unused out-of-sandbox load with `f64x2.splat` operator on x86-64
Details

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.

Database specific 
{
    "cwe_ids": [
        "CWE-248"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34944.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "43.0.0"
                },
                {
                    "fixed": "44.0.1"
                }
            ]
        }
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/bytecodealliance/wasmtime

Affected ranges

Type
GIT
Repo
https://github.com/bytecodealliance/wasmtime
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a15daff0bfc965d1656ddcf9beaa1d085c3a7410
Introduced
0b195ef5db76c02fb5392ec1418c58bdc5537d41
Fixed
09539085b9b514b65d5c51e2905dc38f6eb414b9
Introduced
7b3d6ae79e9153a2477668062f5622c10333925f
Fixed
403f9929d4e13ed87c76471d4f4bc8d381c876eb
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "24.0.7"
        },
        {
            "introduced": "25.0.0"
        },
        {
            "fixed": "36.0.7"
        },
        {
            "introduced": "37.0.0"
        },
        {
            "fixed": "42.0.2"
        }
    ]
}

Affected versions

cranelift-v0.*
cranelift-v0.60.0
cranelift-v0.61.0
cranelift-v0.69.0
Other
dev
v0.*
v0.12.0
v0.16.0
v0.17.0
v0.18.0
v0.19.0
v0.20.0
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.26.0
v0.27.0
v0.28.0
v0.29.0
v0.30.0
v0.31.0
v0.32.0
v0.33.0
v0.34.0
v0.35.0
v24.*
v24.0.0
v24.0.1
v24.0.2
v24.0.3
v24.0.4
v24.0.5
v24.0.6
v36.*
v36.0.0
v36.0.1
v36.0.2
v36.0.3
v36.0.4
v36.0.5
v36.0.6
v42.*
v42.0.0
v42.0.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-34944.json"