{
  "cveId": "CVE-2026-44988",
  "url": "https://patchblox.com/security/cve/CVE-2026-44988",
  "summary": "CVE-2026-44988 is fixed in 4 products on 1 platform, first by libvncclient1 0.9.15\u002Bdfsg-3ubuntu0.1, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libvncserver: LibVNCClient is a library for easy implementation of a VNC client",
  "description": "LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient\u0027s Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-controlled rectangle width and writes beyond fixed-size Gradient buffers. This vulnerability is fixed with commit 5b270544b85233668b98161323297d418a8f5fd1.",
  "published": "2026-05-27T08:16:00Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss": 0.00242,
  "epssPercentile": 0.1542,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "LibVNCServer",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "0.9.14-160000.5.1",
      "fix": "OPENSUSE-SU-2026:21118-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21118-1",
      "released": "2026-06-20T06:50:30Z"
    },
    {
      "platform": "linux",
      "product": "LibVNCServer",
      "release": "sles 15.7",
      "fixedVersion": "0.9.14-150600.3.9.1",
      "fix": "SUSE-SU-2026:2427-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2427-1",
      "released": "2026-06-17T09:50:22Z"
    },
    {
      "platform": "linux",
      "product": "LibVNCServer",
      "release": "sles 16.0",
      "fixedVersion": "0.9.14-160000.5.1",
      "fix": "SUSE-SU-2026:22190-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22190-1",
      "released": "2026-06-20T06:50:27Z"
    },
    {
      "platform": "linux",
      "product": "libvncclient1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "0.9.13\u002Bdfsg-3ubuntu0.1",
      "fix": "libvncclient1 0.9.13\u002Bdfsg-3ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libvncclient1-0.9.13-dfsg-3ubuntu0.1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "libvncclient1",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "0.9.14\u002Bdfsg-1ubuntu0.1",
      "fix": "libvncclient1 0.9.14\u002Bdfsg-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libvncclient1-0.9.14-dfsg-1ubuntu0.1",
      "released": "2026-06-24T14:07:41Z"
    },
    {
      "platform": "linux",
      "product": "libvncclient1",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "0.9.15\u002Bdfsg-1ubuntu0.1",
      "fix": "libvncclient1 0.9.15\u002Bdfsg-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libvncclient1-0.9.15-dfsg-1ubuntu0.1",
      "released": "2026-06-24T14:07:44Z"
    },
    {
      "platform": "linux",
      "product": "libvncclient1",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "0.9.15\u002Bdfsg-3ubuntu0.1",
      "fix": "libvncclient1 0.9.15\u002Bdfsg-3ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libvncclient1-0.9.15-dfsg-3ubuntu0.1",
      "released": "2026-05-27T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "0.9.14\u002Bdfsg-1\u002Bdeb12u2",
      "fix": "DEBIAN-CVE-2026-44988",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44988",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.9.15\u002Bdfsg-1\u002Bdeb13u2",
      "fix": "DEBIAN-CVE-2026-44988",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44988",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver",
      "release": "Debian 14",
      "fixedVersion": "0.9.15\u002Bdfsg-5",
      "fix": "DEBIAN-CVE-2026-44988",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44988",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "0.9.13\u002Bdfsg-3ubuntu0.1",
      "fix": "libvncserver1 0.9.13\u002Bdfsg-3ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libvncserver1-0.9.13-dfsg-3ubuntu0.1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver1",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "0.9.14\u002Bdfsg-1ubuntu0.1",
      "fix": "libvncserver1 0.9.14\u002Bdfsg-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libvncserver1-0.9.14-dfsg-1ubuntu0.1",
      "released": "2026-06-24T14:07:41Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver1",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "0.9.15\u002Bdfsg-1ubuntu0.1",
      "fix": "libvncserver1 0.9.15\u002Bdfsg-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libvncserver1-0.9.15-dfsg-1ubuntu0.1",
      "released": "2026-06-24T14:07:44Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver1",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "0.9.15\u002Bdfsg-3ubuntu0.1",
      "fix": "libvncserver1 0.9.15\u002Bdfsg-3ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libvncserver1-0.9.15-dfsg-3ubuntu0.1",
      "released": "2026-05-27T08:16:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}