CVE-2026-119203

UNKNOWN 0.0

pypdf: Possible infinite loop when hitting EOF in standard xref table during trailer search

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.

CWE	CWE-835
Vendor	py-pdf
Product	pypdf
Published	Oct 29, 2026

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Affected Versions

py-pdf / pypdf

< 6.21.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5 github.com: https://github.com/py-pdf/pypdf/pull/4289 github.com: https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a github.com: https://github.com/py-pdf/pypdf/releases/tag/6.21.4