What is GHSA-f54x-cmq8-qg57?

GHSA-f54x-cmq8-qg57 is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible large memory usage when parsing arrays and dictionaries

Which CVE IDs does GHSA-f54x-cmq8-qg57 cover?

GHSA-f54x-cmq8-qg57 covers the following CVE IDs: CVE-2026-113790. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-f54x-cmq8-qg57?

GHSA-f54x-cmq8-qg57 affects 1 product, including: pip/pypdf:\u003c 6.21.0.

GHSA-f54x-cmq8-qg57Medium

pypdf: Possible large memory usage when parsing arrays and dictionaries

Vendor

GitHub Security Advisories

Published

October 22, 2026

Last Modified

October 22, 2026

🔗 CVE IDs covered (1)

CVE-2026-113790 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing arrays and/or dictionaries with lots of elements.

Patches

This has been fixed in pypdf==6.21.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4218.

🎯 Affected products1

pip/pypdf:< 6.21.0

🔗 References (6)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-f54x-cmq8-qg57
https://nvd.nist.gov/vuln/detail/CVE-2026-113790
https://github.com/py-pdf/pypdf/pull/4218
https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12
https://github.com/py-pdf/pypdf/releases/tag/6.21.0
https://github.com/advisories/GHSA-f54x-cmq8-qg57