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CVE-2026-59933

CVE-2026-59933 · PhpSpreadsheet: XLS/OLE sector-chain self-loop causes memory exhaustion

This page contains facts from public vulnerability sources. Check the original advisory before updating.

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the OLE reader follows sector chains from attacker-controlled XLS/OLE metadata without detecting cycles or enforcing a maximum chain length. A tiny malformed .xls/OLE file can set the small-block depot sector chain to point back to itself. During normal XLS detection, OLERead::read() appends the same sector data repeatedly until the PHP process exhausts memory. This is reachable from Reader\Xls::canRead() and therefore from automatic spreadsheet type detection. Applications that accept attacker-controlled spreadsheet uploads can suffer denial of service from a very small file. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6.

CVSS 7.5 · High · EPSS 0.7% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • phpspreadsheet

    Versions
    • >= 4.0.0, < 5.8.1: Affected
    • >= 3.3.0, < 3.10.7: Affected
    • >= 2.2.0, < 2.4.7: Affected
    • >= 2.0.0, < 2.1.18: Affected
    • < 1.30.6: Affected

    No fix published

  • phpoffice/phpspreadsheet Packagist

    Versions
    • 4.0.0
    • 4.1.0
    • 4.2.0
    • 4.3.0
    • 4.3.1
    • 4.4.0
    • 4.5.0
    • 5.0.0
    • 5.1.0
    • 5.2.0
    • 5.3.0
    • 5.4.0
    • 5.5.0
    • 5.6.0
    • 5.7.0
    • 5.8.0
    Affected ranges
    • ECOSYSTEM: ≥ 4.0.0, < 5.8.1

    Update to 5.8.1

  • phpoffice/phpspreadsheet Packagist

    Versions
    • 3.10.0
    • 3.10.1
    • 3.10.2
    • 3.10.3
    • 3.10.4
    • 3.10.5
    • 3.10.6
    • 3.3.0
    • 3.4.0
    • 3.5.0
    • 3.6.0
    • 3.7.0
    • 3.8.0
    • 3.9.0
    • 3.9.1
    • 3.9.2
    • 3.9.3
    Affected ranges
    • ECOSYSTEM: ≥ 3.3.0, < 3.10.7

    Update to 3.10.7

  • phpoffice/phpspreadsheet Packagist

    Versions
    • 2.2.0
    • 2.2.1
    • 2.2.2
    • 2.3.0
    • 2.3.10
    • 2.3.2
    • 2.3.3
    • 2.3.4
    • 2.3.5
    • 2.3.6
    • 2.3.7
    • 2.3.8
    • 2.3.9
    • 2.4.0
    • 2.4.1
    • 2.4.2
    • 2.4.3
    • 2.4.4
    • 2.4.5
    • 2.4.6
    Affected ranges
    • ECOSYSTEM: ≥ 2.2.0, < 2.4.7

    Update to 2.4.7

  • phpoffice/phpspreadsheet Packagist

    Versions
    • 2.0.0
    • 2.1.0
    • 2.1.1
    • 2.1.10
    • 2.1.11
    • 2.1.12
    • 2.1.13
    • 2.1.14
    • 2.1.15
    • 2.1.16
    • 2.1.17
    • 2.1.3
    • 2.1.4
    • 2.1.5
    • 2.1.6
    • 2.1.7
    • 2.1.8
    • 2.1.9
    Affected ranges
    • ECOSYSTEM: ≥ 2.0.0, < 2.1.18

    Update to 2.1.18

  • phpoffice/phpspreadsheet Packagist

    Versions
    • 1.0.0
    • 1.0.0-beta
    • 1.0.0-beta2
    • 1.1.0
    • 1.10.0
    • 1.10.1
    • 1.11.0
    • 1.12.0
    • 1.13.0
    • 1.14.0
    • 1.14.1
    • 1.15.0
    • 1.16.0
    • 1.17.0
    • 1.17.1
    • 1.18.0
    • 1.19.0
    • 1.2.0
    • 1.2.1
    • 1.20.0
    • 1.21.0
    • 1.22.0
    • 1.23.0
    • 1.24.0
    • 1.24.1
    • 1.25.0
    • 1.25.1
    • 1.25.2
    • 1.26.0
    • 1.27.0
    • 1.27.1
    • 1.28.0
    • 1.29.0
    • 1.29.1
    • 1.29.10
    • 1.29.11
    • 1.29.12
    • 1.29.2
    • 1.29.4
    • 1.29.5
    • 1.29.6
    • 1.29.7
    • 1.29.8
    • 1.29.9
    • 1.3.0
    • 1.3.1
    • 1.30.0
    • 1.30.1
    • 1.30.2
    • 1.30.3
    • 1.30.4
    • 1.30.5
    • 1.4.0
    • 1.4.1
    • 1.5.0
    • 1.5.1
    • 1.5.2
    • 1.6.0
    • 1.7.0
    • 1.8.0
    • 1.8.1
    • 1.8.2
    • 1.9.0
    Affected ranges
    • ECOSYSTEM: < 1.30.6

    Update to 1.30.6

Original sources

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