CVE-2026-119209

UNKNOWN 0.0

pypdf: Possible large memory usage when parsing cross-reference 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 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.

CWE	CWE-400 CWE-770
Vendor	py-pdf
Product	pypdf
Published	Oct 29, 2026

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Affected Versions

py-pdf / pypdf

< 6.21.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc github.com: https://github.com/py-pdf/pypdf/pull/4269 github.com: https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.21.3