CVE-2026-41313: pypdf: Possible long runtimes for wrong size values in incremental mode

April 16, 2026 (updated May 5, 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/commit/c50a0104cf083356f7c7f5d61410466a57f5c88a
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
nvd.nist.gov/vuln/detail/CVE-2026-41313

Code Behaviors & Features

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