PT-2026-26191 · Pypi+1 · Pypdf+1

Kule500 · Published 2026-01-01 · Updated 2026-05-21 · CVE-2026-33123

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions pypdf versions prior to 6.9.1

Description pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to create a malicious PDF that can cause prolonged runtimes and/or significant memory usage. Exploitation requires accessing an array-based stream containing numerous entries. The issue has been addressed in version 6.9.1.

Recommendations Upgrade to pypdf version 6.9.1 or later.

Exploit

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-407

Related Identifiers

BDU:2026-07265

CVE-2026-33123

GHSA-QPXP-75PX-XJCP

OPENSUSE-SU-2026:10402-1

OPENSUSE-SU-2026:10403-1

OPENSUSE-SU-2026:20430-1

Affected Products

Red Os

Pypdf

References · 26

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33123.json · Exploit
• https://github.com/py-pdf/pypdf/pull/3686 · Patch
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10402-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33123 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33123 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33123 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-07265 · Security Note
• https://osv.dev/vulnerability/GHSA-qpxp-75px-xjcp · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33123 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10403-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:20430-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33123 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-PYPI-CVE-2026-33123 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33123 · Vendor Advisory