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CVE-2026-54531 — pypdf: Possible infinite loop when processing outlines/bookmarks in writer

2026-09-30T03:55:56.703594+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0.

GHSA-m2v9-299j-rv96 — pypdf: Possible infinite loop when processing outlines/bookmarks in writer

2026-09-30T03:55:56.703689+00:00

Affected: PyPI: pypdf

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer.

### Patches

This has been fixed in [pypdf==6.13.0](https://github.com/py-pdf/pypdf/releases/tag/6.13.0).

### Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#3830](https://github.com/py-pdf/pypdf/pull/3830).

PYSEC-2026-3022 — pypdf: Possible infinite loop when processing outlines/bookmarks in writer