GHSA-jj6c-8h6c-hppx: pypdf has long runtimes for wrong size values in cross-reference and object streams

April 15, 2026

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large /Size values or object streams with wrong large /N values.

References

github.com/advisories/GHSA-jj6c-8h6c-hppx
github.com/py-pdf/pypdf
github.com/py-pdf/pypdf/pull/3733
github.com/py-pdf/pypdf/releases/tag/6.10.1
github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx

Code Behaviors & Features

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