What is GHSA-23w6-3w8w-8484?

GHSA-23w6-3w8w-8484 is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible long runtimes/large memory usage when retrieving outlines

Which CVE IDs does GHSA-23w6-3w8w-8484 cover?

GHSA-23w6-3w8w-8484 covers the following CVE IDs: CVE-2026-84310. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-23w6-3w8w-8484?

GHSA-23w6-3w8w-8484 affects 1 product, including: pip/pypdf:\u003c 6.16.1.

GHSA-23w6-3w8w-8484Medium

pypdf: Possible long runtimes/large memory usage when retrieving outlines

Vendor

GitHub Security Advisories

Published

September 1, 2026

Last Modified

September 1, 2026

🔗 CVE IDs covered (1)

CVE-2026-84310 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths.

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-23w6-3w8w-8484
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-23w6-3w8w-8484