CVE-2026-58592

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Source

https://cve.org/CVERecord?id=CVE-2026-58592

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58592.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-58592

Published

2026-07-01T19:27:22Z

Modified

2026-09-15T08:16:11Z

Severity

8.9 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CVSS Calculator

Summary

Ladybird - Web-Reachable Code Execution via Dangling FunctionType Reference in WebAssembly ESM Integration

Details

Ladybird before commit 2f9dc7e contains a dangling-reference memory-safety flaw in its WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module via the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm::FunctionType by reference to create_host_function, whose host callback captures and later reads that reference; once the ESM link-loop iteration ends the FunctionType is destroyed, leaving the callback with a dangling reference (the normal instantiate path uses a long-lived reference and is not affected). Stale result-type data lets the host callback return an empty result vector for a statically non-empty result, so the destination register retains an attacker-influenced value that is then consumed by the WASM-GC array.set handler, which bit-casts the reference low bits to an ArrayInstance pointer after only a null check, yielding an arbitrary write. A web page can chain this into code execution in the WebContent process. Verified reachable from HTML content without any instrumentation or source modification.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-787",
        "CWE-825",
        "CWE-843"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58592.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "2f9dc7e9f35eed67dde3f9e8567d390dc4f0c665"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/ladybirdbrowser/ladybird

Affected ranges

Type

GIT

Repo

https://github.com/ladybirdbrowser/ladybird

Events

Introduced

Fixed

2f9dc7e9f35eed67dde3f9e8567d390dc4f0c665

Database specific

Show details

{
    "source": "REFERENCES"
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58592.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "278077153142881579293324696797394102485",
            "length": 1954
        },
        "id": "CVE-2026-58592-06ac5ee4",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/ladybirdbrowser/ladybird/commit/2f9dc7e9f35eed67dde3f9e8567d390dc4f0c665",
        "target": {
            "file": "Libraries/LibWeb/WebAssembly/WebAssembly.cpp",
            "function": "create_host_function"
        }
    },
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            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-58592-b7f9a931",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/ladybirdbrowser/ladybird/commit/2f9dc7e9f35eed67dde3f9e8567d390dc4f0c665",
        "target": {
            "file": "Libraries/LibWeb/WebAssembly/WebAssembly.cpp"
        }
    }
]

vanir_signatures_modified

"2026-09-15T08:16:11Z"