---
id: CVE-2026-22690
title: >-
  pypdf: pypdf: Denial of Service via crafted PDF with missing /Root object
  (CVE-2026-22690)
summary: >-
  A flaw was found in pypdf. A remote attacker can exploit this vulnerability by
  crafting a malicious PDF file that omits the /Root entry in the trailer and
  uses a large /Size value. This can lead to excessively long processing times
  when th…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-400
vendor: Red Hat
product: Red Hat Ansible Automation Platform 2
affected:
  - openshift_lightspeed
  - ansible_automation_platform 2
  - enterprise_linux_ai_rhel_ai 3
  - openshift_ai_rhoai
patched:
  - pypdf 6.6.0
published: '2026-01-10'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:33:22+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22690.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22690.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-22690'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2428428'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-22690'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-22690'
  - url: >-
      https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45
  - url: 'https://github.com/py-pdf/pypdf/pull/3594'
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.6.0'
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg'
  - url: 'https://github.com/py-pdf/pypdf'
tags:
  - csaf
  - vex
  - red-hat
  - osv
  - pip
epss: 0.00433
epssPercentile: 0.37456
aliases:
  - GHSA-4xc4-762w-m6cg
  - PYSEC-2026-1829
ecosystem: pip
ingestedAt: '2026-07-08T18:25:45.724Z'
---

## Overview

A flaw was found in pypdf. A remote attacker can exploit this vulnerability by crafting a malicious PDF file that omits the /Root entry in the trailer and uses a large /Size value. This can lead to excessively long processing times when the PDF is read in non-strict mode, resulting in a Denial of Service (DoS) for the affected system.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22690.json)

**pypdf: pypdf: Denial of Service via crafted PDF with missing /Root object** — rated Moderate by Red Hat. Released 2026-01-10, updated 2026-10-15.

Affected:

- OpenShift Lightspeed
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat OpenShift AI (RHOAI)

No fix planned:

- OpenShift Lightspeed
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat OpenShift AI (RHOAI)

## Remediation

Fix deferred

## Package advisory (CVE-2026-22690)

Affected packages:

- `pypdf < 6.6.0`

Patched in:

- `pypdf 6.6.0`

Source: https://osv.dev/vulnerability/GHSA-4xc4-762w-m6cg