What is GHSA-763m-79hh-57f2?

GHSA-763m-79hh-57f2 is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible long runtimes/large memory usage when extracting XForm objects

Which CVE IDs does GHSA-763m-79hh-57f2 cover?

GHSA-763m-79hh-57f2 covers the following CVE IDs: CVE-2026-84311. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-763m-79hh-57f2?

GHSA-763m-79hh-57f2 affects 1 product, including: pip/pypdf:\u003c 6.16.1.

GHSA-763m-79hh-57f2Medium

pypdf: Possible long runtimes/large memory usage when extracting XForm objects

Vendor

GitHub Security Advisories

Published

September 1, 2026

Last Modified

September 1, 2026

🔗 CVE IDs covered (1)

CVE-2026-84311 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires extracting the text of a page with lots of XForm objects, where some of them might be re-used.

Patches

This has been fixed in pypdf==6.16.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3966.

🎯 Affected products1

pip/pypdf:< 6.16.1

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2
https://github.com/py-pdf/pypdf/pull/3966
https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942
https://github.com/py-pdf/pypdf/releases/tag/6.16.1
https://github.com/advisories/GHSA-763m-79hh-57f2