What is GHSA-6c7f-9265-g8fw?

GHSA-6c7f-9265-g8fw is a security advisory published by GitHub Security Advisories with High severity. pypdf: Possible long runtimes for repeated references to the same missing object

Which CVE IDs does GHSA-6c7f-9265-g8fw cover?

GHSA-6c7f-9265-g8fw covers the following CVE IDs: CVE-2026-115572. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-6c7f-9265-g8fw?

GHSA-6c7f-9265-g8fw affects 1 product, including: pip/pypdf:\u003c 6.21.2.

GHSA-6c7f-9265-g8fwHigh

pypdf: Possible long runtimes for repeated references to the same missing object

Vendor

GitHub Security Advisories

Published

October 23, 2026

Last Modified

October 23, 2026

🔗 CVE IDs covered (1)

CVE-2026-115572 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading relevant parts of a file (like their pages) where the same, but non-existent indirect object is referenced multiple times.

Patches

This has been fixed in pypdf==6.21.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4240.

🎯 Affected products1

pip/pypdf:< 6.21.2

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-6c7f-9265-g8fw
https://github.com/py-pdf/pypdf/pull/4240
https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b
https://github.com/py-pdf/pypdf/releases/tag/6.21.2
https://github.com/advisories/GHSA-6c7f-9265-g8fw