CVE-2026-115889

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Source
https://cve.org/CVERecord?id=CVE-2026-115889
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115889.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-115889
Aliases
Downstream
Published
2026-10-23T21:23:27Z
Modified
2026-10-25T02:45:48Z
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: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
Details

Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-197",
        "CWE-843"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115889.json"
}
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
0d6b8ead4e94b0ce76f925611b831b56570aef94
Introduced
7b3d6ae79e9153a2477668062f5622c10333925f
Fixed
be23469ece57c0be64904f12111c8d808b0ce4ac
Fixed
ba8f7d70caa1825b7f64fa75cd9d03f4a438dae0
Fixed
f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "36.0.19"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "37.0.0"
                },
                {
                    "fixed":  "43.0.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "ba8f7d70caa1825b7f64fa75cd9d03f4a438dae0"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v36.0.19",
            "range":  [
                {
                    "fixed":  "0d6b8ead4e94b0ce76f925611b831b56570aef94"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v43.0.0",
            "range":  [
                {
                    "fixed":  "be23469ece57c0be64904f12111c8d808b0ce4ac"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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
v36.*
v36.0.0
v36.0.1
v36.0.10
v36.0.11
v36.0.12
v36.0.13
v36.0.14
v36.0.15
v36.0.16
v36.0.17
v36.0.18
v36.0.2
v36.0.3
v36.0.4
v36.0.5
v36.0.6
v36.0.7
v36.0.8
v36.0.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115889.json"