What is GHSA-qpxp-75px-xjcp?

GHSA-qpxp-75px-xjcp is a security advisory published by GitHub Security Advisories with Medium severity. pypdf has inefficient decoding of array-based streams

Which CVE IDs does GHSA-qpxp-75px-xjcp cover?

GHSA-qpxp-75px-xjcp covers the following CVE IDs: CVE-2026-33123. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-qpxp-75px-xjcp?

GHSA-qpxp-75px-xjcp affects 1 product, including: pip/pypdf:\u003c 6.9.1.

GHSA-qpxp-75px-xjcpMedium

pypdf has inefficient decoding of array-based streams

Vendor

GitHub Security Advisories

Published

March 18, 2026

Last Modified

March 20, 2026

🔗 CVE IDs covered (1)

CVE-2026-33123 →

📋 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.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3686.

🎯 Affected products1

pip/pypdf:< 6.9.1

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp
https://github.com/py-pdf/pypdf/pull/3686
https://github.com/py-pdf/pypdf/releases/tag/6.9.1
https://nvd.nist.gov/vuln/detail/CVE-2026-33123
https://github.com/advisories/GHSA-qpxp-75px-xjcp