What is GHSA-gmh7-3g9r-mjh5?

GHSA-gmh7-3g9r-mjh5 is a security advisory published by GitHub Security Advisories with High severity. pypdf: Possible long runtimes for large xref table header limits

Which CVE IDs does GHSA-gmh7-3g9r-mjh5 cover?

GHSA-gmh7-3g9r-mjh5 covers the following CVE IDs: CVE-2026-115580. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-gmh7-3g9r-mjh5?

GHSA-gmh7-3g9r-mjh5 affects 1 product, including: pip/pypdf:\u003c 6.21.2.

GHSA-gmh7-3g9r-mjh5High

pypdf: Possible long runtimes for large xref table header limits

Vendor

GitHub Security Advisories

Published

October 23, 2026

Last Modified

October 23, 2026

🔗 CVE IDs covered (1)

CVE-2026-115580 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires opening a file with large/wrong upper limits in the xref table.

Patches

This has been fixed in pypdf==6.21.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4239.

🎯 Affected products1

pip/pypdf:< 6.21.2

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5
https://github.com/py-pdf/pypdf/pull/4239
https://github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2
https://github.com/py-pdf/pypdf/releases/tag/6.21.2
https://github.com/advisories/GHSA-gmh7-3g9r-mjh5