Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-30T21:59:46 pypdf: pypdf: Denial of Service via crafted PDF with missing stream length 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CWE-770

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.

A flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file that, when parsed, leads to uncontrolled resource consumption and large memory usage. This occurs because the library sometimes ignores defined limits for stream lengths when a content stream lacks a /Length value. Successful exploitation could result in a Denial of Service (DoS) condition, making the system or application unavailable.

This Moderate flaw in pypdf can lead to a Denial of Service (DoS) due to uncontrolled memory consumption when processing a specially crafted PDF file. The vulnerability arises from the library's failure to properly enforce stream length limits in certain scenarios, allowing an attacker to exhaust system resources. Red Hat products that process untrusted PDF content, such as Red Hat Enterprise Linux AI, Red Hat Quay, Red Hat Ansible Automation Platform, and OpenShift Lightspeed, are affected if they handle untrusted PDF inputs. To mitigate this issue, Red Hat recommends avoiding the processing of untrusted PDF files with applications utilizing the pypdf library. Additionally, deploying applications that handle PDF content within a sandboxed environment can limit the potential impact of successful exploitation. Exploit Intelligence Fix deferred exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 OpenShift Lightspeed Fix deferred openshift-lightspeed/lightspeed-ocp-rag-rhel9 OpenShift Lightspeed Fix deferred openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-25/lightspeed-chatbot-rhel8 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-gaudi-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-rocm-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/disk-image-cuda-rhel9 Red Hat OpenShift AI (RHOAI) Fix deferred rhoai/odh-llama-stack-core-rhel9 Red Hat Quay 3 Fix deferred quay/quay-rhel8 Red Hat Quay 3 Fix deferred quay/quay-rhel9 https://www.cve.org/CVERecord?id=CVE-2026-57204 https://nvd.nist.gov/vuln/detail/CVE-2026-57204 https://github.com/py-pdf/pypdf/releases/tag/6.13.3 https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94