CVE-2026-41168: pypdf has long runtimes for wrong size values in cross-reference and object streams

April 15, 2026 (updated April 24, 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/commit/62338e9d36419cf193ccec7331784f45df1d70b3
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
nvd.nist.gov/vuln/detail/CVE-2026-41168

Code Behaviors & Features

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