CVE-2026-33123 | py-pdf pypdf up to 6.9.0 PDF resource consumption

VDB-352047 · CVE-2026-33123 · GCVE-0-2026-33123 PY-PDF PYPDF UP TO 6.9.0 PDF RESOURCE CONSUMPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.68+ Summaryinfo A vulnerability has been found in py-pdf pypdf up to 6.9.0 and classified as problematic. This vulnerability affects unknown code of the component PDF Handler. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2026-33123. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded. Detailsinfo A vulnerability, which was classified as problematic, was found in py-pdf pypdf up to 6.9.0. This affects an unknown part of the component PDF Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is: pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-33123 since 03/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. Upgrading to version 6.9.1 eliminates this vulnerability. Productinfo Vendor py-pdf Name pypdf Version 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9.0 Website Product: https://github.com/py-pdf/pypdf/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Resource consumption CWE: CWE-400 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: pypdf 6.9.1 Timelineinfo 03/17/2026 CVE reserved 03/20/2026 +3 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33123 (🔒) GCVE (CVE): GCVE-0-2026-33123 GCVE (VulDB): GCVE-100-352047 Entryinfo Created: 03/20/2026 11:01 Changes: 03/20/2026 11:01 (67) Complete: 🔍 Cache ID: 99:DED:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸