CVE-2026-119206

UNKNOWN 0.0

pypdf: Possible long runtimes when retrieving page labels

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.

CWE	CWE-400
Vendor	py-pdf
Product	pypdf
Published	Oct 29, 2026

Stay Ahead of the Next One

Get instant alerts for py-pdf pypdf

Be the first to know when new unknown vulnerabilities affecting py-pdf pypdf are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

py-pdf / pypdf

< 6.21.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw github.com: https://github.com/py-pdf/pypdf/pull/4251 github.com: https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e github.com: https://github.com/py-pdf/pypdf/releases/tag/6.21.3