{"id":"CVE-2026-54063","aliases":["GHSA-h69g-9hx6-f3v4","GO-2026-5960"],"url":"https://o3.security/vulnerability/CVE-2026-54063","summary":"Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS)","details":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. Prior to 2.11.0, the checkSheet() function in github.com/xuri/excelize/v2 uses an attacker-controlled <row r=\"N\"> XML attribute value directly as the length argument to make([]xlsxRow, row) without validating it against the Excel row limit (TotalRows = 1,048,576). A specially crafted XLSX file can trigger two denial-of-service variants: (A) an out-of-memory process kill when r=2147483647 forces a ~16 GB allocation attempt, and (B) a runtime panic via out-of-bounds slice indexing when r=-1. Any service that opens attacker-supplied XLSX files and calls GetCellValue is affected. No authentication is required. This issue is fixed in version 2.11.0.","published":"2026-07-10T15:53:31.020Z","modified":"2026-08-12T18:48:05.205981486Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00607,"percentile":0.46358,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/xuri/excelize/v2","fixedVersion":"2.11.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/qax-os/excelize/releases/tag/v2.11.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54063.json"},{"type":"ADVISORY","url":"https://github.com/qax-os/excelize/security/advisories/GHSA-h69g-9hx6-f3v4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54063"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T18:48:05.205981486Z"}}