{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "24.1.13"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c5a47fda896aeefbf1d06a73e392a294344f9e1a"
            },
            {
              "fixed": "fbf7bac22e2c6bd627fb042742a23318263edae1"
            }
          ],
          "repo": "https://gitlab.freedesktop.org/xorg/xserver",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "suse",
    "cwe_ids": [
      "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55999.json"
  },
  "details": "Local attackers with a X connection able to provide PCX fonts to the X \nserver xorg-server before 21.2.24 and xwayland before 24.1.13 could \ncause a heap buffer overflow via SetFont due to missing glyph boundary checks.",
  "id": "CVE-2026-55999",
  "modified": "2026-07-15T01:48:55.892468034Z",
  "published": "2026-07-08T08:07:11.088Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55999.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55999"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.openwall.com/lists/oss-security/2026/07/08/2"
    },
    {
      "type": "FIX",
      "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.freedesktop.org/xorg/xserver/"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "xorg-server / xwayland glamor font atlas Heap Buffer Overflow"
}