CVE-2026-119209: pypdf has possible large memory usage when parsing cross-reference streams

October 30, 2026

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires opening a file with cross-reference streams.

References

github.com/advisories/GHSA-x3rh-gjgm-fmqc
github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4
github.com/py-pdf/pypdf/pull/4269
github.com/py-pdf/pypdf/releases/tag/6.21.3
github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc
nvd.nist.gov/vuln/detail/CVE-2026-119209

Code Behaviors & Features

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