What is GHSA-fp3f-mc75-235c?

GHSA-fp3f-mc75-235c is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible large memory usage for large /ToUnicode streams

Which CVE IDs does GHSA-fp3f-mc75-235c cover?

GHSA-fp3f-mc75-235c covers the following CVE IDs: CVE-2026-71870. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-fp3f-mc75-235c?

GHSA-fp3f-mc75-235c affects 1 product, including: pip/pypdf:\u003c 6.15.0.

GHSA-fp3f-mc75-235cMedium

pypdf: Possible large memory usage for large /ToUnicode streams

Vendor

GitHub Security Advisories

Published

August 7, 2026

Last Modified

August 7, 2026

🔗 CVE IDs covered (1)

CVE-2026-71870 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction.

Patches

This has been fixed in pypdf==6.15.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3944.

🎯 Affected products1

pip/pypdf:< 6.15.0

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c
https://github.com/py-pdf/pypdf/pull/3944
https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa
https://github.com/py-pdf/pypdf/releases/tag/6.15.0
https://github.com/advisories/GHSA-fp3f-mc75-235c