CVE-2026-102998

UNKNOWN 0.0

pypdf: Possible long runtimes when generating appearance streams

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.

CWE	CWE-400
Vendor	py-pdf
Product	pypdf
Published	Sep 30, 2026
Last Updated	Sep 30, 2026

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Affected Versions

py-pdf / pypdf

< 6.19.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj github.com: https://github.com/py-pdf/pypdf/pull/4087 github.com: https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.19.0