{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-9539",
        "assignerOrgId": "b1571b85-cbc9-431f-830b-0c8155323a69",
        "state": "PUBLISHED",
        "assignerShortName": "STAR_Labs",
        "dateReserved": "2026-05-26T02:36:53.227Z",
        "datePublished": "2026-06-24T04:37:01.955Z",
        "dateUpdated": "2026-06-24T12:39:59.831Z"
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    "containers": {
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                "shortName": "STAR_Labs",
                "dateUpdated": "2026-06-24T04:37:01.955Z"
            },
            "title": "libslirp TCP URG OOB Read Information Leak",
            "datePublic": "2026-06-24T04:25:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-125",
                            "description": "CWE-125 Out-of-bounds read",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-131",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-131 Resource Leak Exposure"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "freedesktop.org",
                    "product": "libslirp",
                    "repo": "https://gitlab.freedesktop.org/slirp/libslirp/",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "4.9.2",
                            "changes": [
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                                    "at": "4.9.2",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "semver"
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            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).",
                    "supportingMedia": [
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                            "type": "text/html",
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                            "value": "An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp)."
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93",
                    "tags": [
                        "issue-tracking"
                    ]
                },
                {
                    "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84",
                    "tags": [
                        "patch"
                    ]
                },
                {
                    "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2",
                    "tags": [
                        "release-notes"
                    ]
                }
            ],
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                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
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                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "LOCAL",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "scope": "CHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 6.5,
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Bruce Chen of STAR Labs SG Pte. Ltd.",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Shi Weiming of STAR Labs SG Pte. Ltd.",
                    "type": "finder"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
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        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-24T12:39:41.276722Z",
                                "id": "CVE-2026-9539",
                                "options": [
                                    {
                                        "Exploitation": "poc"
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                                    {
                                        "Automatable": "no"
                                    },
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                                        "Technical Impact": "partial"
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                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
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                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-06-24T12:39:59.831Z"
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