---
id: CVE-2026-33123
title: >-
  pypdf: pypdf: Denial of Service due to excessive resource consumption from
  crafted PDF (CVE-2026-33123)
summary: >-
  A flaw was found in pypdf, a pure-python PDF library. An attacker can craft a
  malicious PDF file that, when processed, leads to excessive resource
  consumption, causing long runtimes and high memory usage. This can result in a
  Denial of Ser…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cvssSource: vendor
cwe: CWE-770
vendor: Red Hat
product: OpenShift Lightspeed
affected:
  - lightspeed_core
  - openshift_lightspeed
  - ansible_automation_platform 2
  - enterprise_linux_ai_rhel_ai 3
  - openshift_ai_rhoai
patched:
  - pypdf 6.9.1
published: '2026-03-20'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:35:19+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33123.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33123.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-33123'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2449585'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-33123'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33123'
  - url: 'https://github.com/py-pdf/pypdf/pull/3686'
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.9.1'
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp'
  - url: 'https://github.com/py-pdf/pypdf'
tags:
  - csaf
  - vex
  - red-hat
  - osv
  - pip
epss: 0.00355
epssPercentile: 0.29076
aliases:
  - GHSA-qpxp-75px-xjcp
  - PYSEC-2026-3023
ecosystem: pip
ingestedAt: '2026-07-13T18:58:02.180Z'
---

## Overview

A flaw was found in pypdf, a pure-python PDF library. An attacker can craft a malicious PDF file that, when processed, leads to excessive resource consumption, causing long runtimes and high memory usage. This can result in a Denial of Service (DoS) condition, making the application unresponsive or unstable.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Lightspeed Core, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Lightspeed Core, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33123.json)

**pypdf: pypdf: Denial of Service due to excessive resource consumption from crafted PDF** — rated Moderate by Red Hat. Released 2026-03-20, updated 2026-10-15.

Affected:

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

No fix planned:

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

## Remediation

Fix deferred

Workarounds / mitigations:

- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

## Package advisory (CVE-2026-33123)

Affected packages:

- `pypdf < 6.9.1`

Patched in:

- `pypdf 6.9.1`

Source: https://osv.dev/vulnerability/GHSA-qpxp-75px-xjcp