What is GHSA-55h5-xmcq-c37v?

GHSA-55h5-xmcq-c37v is a security advisory published by GitHub Security Advisories with Medium severity. pypdf: Possible long runtimes for repeated malformed cross-reference entries

Which CVE IDs does GHSA-55h5-xmcq-c37v cover?

GHSA-55h5-xmcq-c37v covers the following CVE IDs: CVE-2026-59937. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-55h5-xmcq-c37v?

GHSA-55h5-xmcq-c37v affects 1 product, including: pip/pypdf:\u003c 6.14.0.

GHSA-55h5-xmcq-c37vMedium

pypdf: Possible long runtimes for repeated malformed cross-reference entries

Vendor

GitHub Security Advisories

Published

July 23, 2026

Last Modified

July 23, 2026

🔗 CVE IDs covered (1)

CVE-2026-59937 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.

Patches

This has been fixed in pypdf==6.14.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3887.

🎯 Affected products1

pip/pypdf:< 6.14.0

🔗 References (6)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v
https://nvd.nist.gov/vuln/detail/CVE-2026-59937
https://github.com/py-pdf/pypdf/pull/3887
https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae
https://github.com/py-pdf/pypdf/releases/tag/6.14.0
https://github.com/advisories/GHSA-55h5-xmcq-c37v