CVE-2026-48156

UNKNOWN 0.0

pypdf: Possible long runtimes for zero-only width values in cross-reference streams

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

2th

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

CWE	CWE-834
Vendor	py-pdf
Product	pypdf
Published	May 28, 2026
Last Updated	May 30, 2026

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Affected Versions

py-pdf / pypdf

< 6.12.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6 github.com: https://github.com/py-pdf/pypdf/pull/3791 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.12.0