CVE-2026-115580

UNKNOWN 0.0

pypdf: Possible long runtimes for large xref table header limits

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.

CWE	CWE-834
Vendor	py-pdf
Product	pypdf
Published	Oct 23, 2026

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Affected Versions

py-pdf / pypdf

< 6.21.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5 github.com: https://github.com/py-pdf/pypdf/pull/4239 github.com: https://github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.21.2