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

2026-09-29T05:29:44.687700+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 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. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.

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

2026-09-29T05:29:44.687792+00:00

Affected: PyPI: pypdf

### Impact

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.

### Patches

This has been fixed in [pypdf==6.10.1](https://github.com/py-pdf/pypdf/releases/tag/6.10.1).

### Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#3733](https://github.com/py-pdf/pypdf/pull/3733).