CVE-2026-54651

UNKNOWN 0.0

pypdf: Possible infinite loop when processing threads/articles in writer

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.

CWE	CWE-835
Vendor	py-pdf
Product	pypdf
Published	Jun 22, 2026

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Affected Versions

py-pdf / pypdf

< 6.13.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcj github.com: https://github.com/py-pdf/pypdf/pull/3839 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.13.1