CVE-2026-59937

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.3%

EPSS Percentile

22th

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.

CWE	CWE-400
Vendor	py-pdf
Product	pypdf
Published	Jul 8, 2026
Last Updated	Jul 9, 2026

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Affected Versions

py-pdf / pypdf

< 6.14.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v github.com: https://github.com/py-pdf/pypdf/pull/3887 github.com: https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae github.com: https://github.com/py-pdf/pypdf/releases/tag/6.14.0