{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "9.2.0565"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "63680c6d3d52477817b49cd1a66e7aabe8a7aa19"
            }
          ],
          "repo": "https://github.com/vim/vim",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-47gw-8gc3-mgcm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52859.json"
  },
  "details": "Vim is an open source, command line text editor. Prior to version 9.2.0565, the update_snapshot() function in src/terminal.c copies the visible terminal screen into the scrollback buffer when a snapshot is taken. For each screen cell it walks the cell's chars[] array with no upper bound, stopping only when it encounters a NUL terminator. When a cell legitimately fills all VTERM_MAX_CHARS_PER_CELL (6) slots — a base character plus five combining marks — the bundled libvterm returns the array without a terminating NUL, so the loop reads past the fixed six-element array and appends the out-of-bounds values to a buffer reserved for only six characters. A program whose output is rendered inside a :terminal window can trigger this with a short byte sequence and no Vim scripting, leading to a crash. This issue has been patched in version 9.2.0565.",
  "id": "CVE-2026-52859",
  "modified": "2026-07-30T11:32:06.506580953Z",
  "published": "2026-06-11T18:33:09.886Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vim/vim/releases/tag/v9.2.0565"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52859.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vim/vim/security/advisories/GHSA-47gw-8gc3-mgcm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52859"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vim/vim/commit/63680c6d3d52477817b49cd1a66e7aabe8a7aa19"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vim: Out-of-bounds Read in Terminal Screen Snapshot"
}