What is GHSA-9mx8-4j7g-633p?

GHSA-9mx8-4j7g-633p is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible infinite loop when removing tree items

Which CVE IDs does GHSA-9mx8-4j7g-633p cover?

GHSA-9mx8-4j7g-633p covers the following CVE IDs: CVE-2026-113793. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-9mx8-4j7g-633p?

GHSA-9mx8-4j7g-633p affects 1 product, including: pip/pypdf:\u003c 6.20.1.

GHSA-9mx8-4j7g-633pMedium

pypdf: Possible infinite loop when removing tree items

Vendor

GitHub Security Advisories

Published

October 21, 2026

Last Modified

October 21, 2026

🔗 CVE IDs covered (1)

CVE-2026-113793 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires removing an object from a tree, for example an outline item.

Patches

This has been fixed in pypdf==6.20.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4188.

🎯 Affected products1

pip/pypdf:< 6.20.1

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mx8-4j7g-633p
https://github.com/py-pdf/pypdf/pull/4188
https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0
https://github.com/py-pdf/pypdf/releases/tag/6.20.1
https://github.com/advisories/GHSA-9mx8-4j7g-633p