---
id: CVE-2026-108358
title: >-
  PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and
  Denial of Service
summary: >-
  PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet
  files. Prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0, XmlScanner::scan in
  src/PhpSpreadsheet/Reader/Security/XmlScanner.php uses a DOCTYPE detection
  pattern th…
severity: high
cvss: 8.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-611
  - CWE-776
vendor: PHPOffice
product: PhpSpreadsheet
affected:
  - PhpSpreadsheet < 1.30.7
  - 'PhpSpreadsheet >= 2.0.0, < 2.1.19'
  - 'PhpSpreadsheet >= 2.2.0, < 2.4.8'
  - 'PhpSpreadsheet >= 3.3.0, < 3.10.8'
  - 'PhpSpreadsheet >= 4.0.0, < 5.10.0'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-23T17:32:56.137020Z'
published: '2026-10-22'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T21:08:28.517Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-108358'
references:
  - url: >-
      https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c
    label: >-
      https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c
  - url: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66
    label: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66
  - url: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781
    label: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781
  - url: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738
    label: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738
  - url: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9
    label: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9
  - url: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c
    label: >-
      https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c
  - url: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7'
    label: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7'
  - url: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19'
    label: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19'
  - url: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8'
    label: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8'
  - url: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8'
    label: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8'
  - url: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0'
    label: 'https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0'
tags:
  - cve.org
epss: 0.00385
epssPercentile: 0.31421
ingestedAt: '2026-10-22T22:00:50.353Z'
---

## Overview

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0, XmlScanner::scan in src/PhpSpreadsheet/Reader/Security/XmlScanner.php uses a DOCTYPE detection pattern that accounts for NUL-byte interleaving but not ISO-2022 escape sequences in XLSX XML parts. The escape sequences prevent the scanner from matching the declaration, and XML charset normalization then removes the escape bytes before parsing, exposing a valid DOCTYPE and entity definitions. Processing an attacker-controlled XLSX can therefore cause entity-expansion denial of service on supported PHP versions and can permit local file access or SSRF on PHP before 8.0 or when LIBXML_NOENT is enabled. This issue is fixed in versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.

## Affected

- `PhpSpreadsheet < 1.30.7`
- `PhpSpreadsheet >= 2.0.0, < 2.1.19`
- `PhpSpreadsheet >= 2.2.0, < 2.4.8`
- `PhpSpreadsheet >= 3.3.0, < 3.10.8`
- `PhpSpreadsheet >= 4.0.0, < 5.10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.