CVE-2026-115580: pypdf: Possible long runtimes for large xref table header limits

October 23, 2026

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires opening a file with large/wrong upper limits in the xref table.

References

github.com/advisories/GHSA-gmh7-3g9r-mjh5
github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2
github.com/py-pdf/pypdf/pull/4239
github.com/py-pdf/pypdf/releases/tag/6.21.2
github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5
nvd.nist.gov/vuln/detail/CVE-2026-115580

Code Behaviors & Features

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