CVE-2026-33123

MEDIUM
2026-03-18 https://github.com/py-pdf/pypdf GHSA-qpxp-75px-xjcp
6.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 18, 2026 - 16:30 vuln.today
Patch Released
Mar 18, 2026 - 16:30 nvd
Patch available
CVE Published
Mar 18, 2026 - 16:17 nvd
MEDIUM 6.5

Tags

Denial Of Service

Description

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. ### Patches This has been fixed in [pypdf==6.9.1](https://github.com/py-pdf/pypdf/releases/tag/6.9.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3686](https://github.com/py-pdf/pypdf/pull/3686).

Analysis

A Denial of Service vulnerability exists in pypdf (Python PDF library) where an attacker can craft a malicious PDF file that causes excessive runtime and memory consumption by exploiting improper handling of array-based streams with large numbers of entries. All versions of pypdf prior to 6.9.1 are affected. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

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Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +32
POC: 0

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CVE-2026-33123 vulnerability details – vuln.today
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