What is CVE-2026-40902?

CVE-2026-40902 is a high-severity vulnerability in Phpoffice Phpspreadsheet, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-12.

How severe is CVE-2026-40902?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Phpoffice Phpspreadsheet

CVE-2026-40902

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 XLSX reader's ColumnAndRowAttributes::readRowAttributes() method reads row numbers from XML attributes w…

EPSS: 0.001 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Phpoffice Phpspreadsheet — versions < 1.30.4, >= 2.0.0, < 2.1.16, >= 2.2.0, < 2.4.5

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40902?: CVE-2026-40902 is a high-severity vulnerability in Phpoffice Phpspreadsheet, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-12.
How severe is CVE-2026-40902?: High severity. CVSS v3 base score is 7.5 out of 10.