GHSA-4pxv-j86v-mhcw: pypdf: Possible long runtimes for wrong size values in incremental mode

April 16, 2026

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer /Size value in incremental mode.

References

github.com/advisories/GHSA-4pxv-j86v-mhcw
github.com/py-pdf/pypdf
github.com/py-pdf/pypdf/pull/3735
github.com/py-pdf/pypdf/releases/tag/6.10.2
github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcw

Code Behaviors & Features

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