{
  "cveId": "CVE-2026-9539",
  "url": "https://patchblox.com/security/cve/CVE-2026-9539",
  "summary": "CVE-2026-9539 is fixed in 2 products on 1 platform, first by libslirp0 4.9.1-1ubuntu1.1, released June 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libslirp TCP URG OOB Read Information Leak",
  "description": "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).",
  "published": "2026-06-23T22:17:00Z",
  "severity": "Moderate",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
  "cwe": "Out-of-bounds Read",
  "epss": 0.00221,
  "epssPercentile": 0.12795,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-9539",
  "fixes": [
    {
      "platform": "linux",
      "product": "libslirp",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.8.0-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-9539",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-9539",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "libslirp",
      "release": "Debian 14",
      "fixedVersion": "4.9.2-1",
      "fix": "DEBIAN-CVE-2026-9539",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-9539",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "libslirp",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "4.8.0\u002B2-160000.3.1",
      "fix": "OPENSUSE-SU-2026:21216-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21216-1",
      "released": "2026-07-02T09:52:17Z"
    },
    {
      "platform": "linux",
      "product": "libslirp",
      "release": "sles 15.7",
      "fixedVersion": "4.7.0\u002B44-150500.4.3.1",
      "fix": "SUSE-SU-2026:2931-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2931-1",
      "released": "2026-07-13T18:43:57Z"
    },
    {
      "platform": "linux",
      "product": "libslirp0",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.6.1-1ubuntu0.2",
      "fix": "libslirp0 4.6.1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libslirp0-4.6.1-1ubuntu0.2",
      "released": "2026-07-18T12:43:06Z"
    },
    {
      "platform": "linux",
      "product": "libslirp0",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.7.0-1ubuntu3.1",
      "fix": "libslirp0 4.7.0-1ubuntu3.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libslirp0-4.7.0-1ubuntu3.1",
      "released": "2026-07-18T12:43:09Z"
    },
    {
      "platform": "linux",
      "product": "libslirp0",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.9.1-1ubuntu1.1",
      "fix": "libslirp0 4.9.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libslirp0-4.9.1-1ubuntu1.1",
      "released": "2026-06-23T22:17:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}