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CVE-2026-40863

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the SpreadsheetML XML reader (Reader\Xml) does not validate the ss:Index row attribute against the maximum allowed row count (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a SpreadsheetML XML file with ss:Index="999999999" on a <Row> element, which inflates the internal cachedHighestRow to ~1 billion. Any subsequent call to getRowIterator() without an exp
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:77e17e2c172760b92f4b190289f50b07700fe9d5b34cb9c283e4d8ffa5c70565
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"PhpSpreadsheet","vendor":"PHPOffice","versions":[{"status":"affected","version":"< 1.30.4"},{"status":"affected","version":">= 2.0.0, < 2.1.16"},{"status":"affected","version":">= 2.2.0, < 2.4.5"},{"status":"affected","version":">= 3.3.0, < 3.10.5"},{"status":"affected","version":">= 4.0.0, < 5.7.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c45a894ef220718d86b7ba029808e9b60b85e02cc336d9cfa960452ecd37993 · sha256:b3a4c7d4cef4c93d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c45a894ef220718d86b7ba029808e9b60b85e02cc336d9cfa960452ecd37993 · sha256:b3a4c7d4cef4c93d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c45a894ef220718d86b7ba029808e9b60b85e02cc336d9cfa960452ecd37993 · sha256:b3a4c7d4cef4c93d… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c45a894ef220718d86b7ba029808e9b60b85e02cc336d9cfa960452ecd37993 · sha256:b3a4c7d4cef4c93d… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c45a894ef220718d86b7ba029808e9b60b85e02cc336d9cfa960452ecd37993 · sha256:b3a4c7d4cef4c93d… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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