CVE-2026-9539

{
  "id": "CVE-2026-9539",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-24T05:17:31.100",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "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)."
    },
    {
      "lang": "es",
      "value": "Una lectura de montón fuera de límites y un desbordamiento negativo de enteros en el manejo de datos urgentes TCP (sosendoob) en la versión de libslirp de freedesktop.org anterior a la v4.9.2 en entornos de host de hipervisor (p. ej., QEMU) permite a un atacante de VM invitado privilegiado (root o CAP_NET_RAW) filtrar gigabytes de memoria de montón sensible del proceso del host mediante el envío de segmentos TCP manipulados con banderas URG manipuladas y punteros urgentes (ti_urp)."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "freedesktop.org",
          "product": "libslirp",
          "defaultStatus": "unaffected",
          "repo": "https://gitlab.freedesktop.org/slirp/libslirp/",
          "versions": [
            {
              "version": "0",
              "lessThan": "4.9.2",
              "versionType": "semver",
              "status": "affected",
              "changes": [
                {
                  "at": "4.9.2",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 4.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-24T12:39:41.276722Z",
          "id": "CVE-2026-9539",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84",
      "source": "[email protected]"
    },
    {
      "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2",
      "source": "[email protected]"
    },
    {
      "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93",
      "source": "[email protected]"
    },
    {
      "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}