What is GHSA-87mj-5ggw-8qc3?

GHSA-87mj-5ggw-8qc3 is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

Which CVE IDs does GHSA-87mj-5ggw-8qc3 cover?

GHSA-87mj-5ggw-8qc3 covers the following CVE IDs: CVE-2026-33699. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-87mj-5ggw-8qc3?

GHSA-87mj-5ggw-8qc3 affects 1 product, including: pip/pypdf:\u003c 6.9.2.

GHSA-87mj-5ggw-8qc3Medium

pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

Vendor

GitHub Security Advisories

Published

March 25, 2026

Last Modified

March 27, 2026

🔗 CVE IDs covered (1)

CVE-2026-33699 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode.

Patches

This has been fixed in pypdf==6.9.2.

Workarounds

If users cannot upgrade yet, consider applying the changes from PR #3693.

🎯 Affected products1

pip/pypdf:< 6.9.2

🔗 References (5)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
https://github.com/py-pdf/pypdf/pull/3693
https://github.com/py-pdf/pypdf/releases/tag/6.9.2
https://nvd.nist.gov/vuln/detail/CVE-2026-33699
https://github.com/advisories/GHSA-87mj-5ggw-8qc3