CVE-2026-115572: pypdf: Possible long runtimes for repeated references to the same missing object

October 23, 2026

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading relevant parts of a file (like their pages) where the same, but non-existent indirect object is referenced multiple times.

References

github.com/advisories/GHSA-6c7f-9265-g8fw
github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b
github.com/py-pdf/pypdf/pull/4240
github.com/py-pdf/pypdf/releases/tag/6.21.2
github.com/py-pdf/pypdf/security/advisories/GHSA-6c7f-9265-g8fw
nvd.nist.gov/vuln/detail/CVE-2026-115572

Code Behaviors & Features

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