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CVE-2026-27024 — pypdf has a possible infinite loop when processing TreeObject

2026-09-29T13:34:43.161578+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.

GHSA-996q-pr4m-cvgq — pypdf has a possible infinite loop when processing TreeObject

2026-09-29T13:34:43.161891+00:00

Affected: PyPI: pypdf

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a `TreeObject`, for example as part of outlines.

### Patches

This has been fixed in [pypdf==6.7.1](https://github.com/py-pdf/pypdf/releases/tag/6.7.1).

### Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#3645](https://github.com/py-pdf/pypdf/pull/3645).

PYSEC-2026-3013 — pypdf has a possible infinite loop when processing TreeObject