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CVE-2026-54651 — pypdf: Possible infinite loop when processing threads/articles in writer

2026-10-03T07:29:59.011596+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.

GHSA-g9xf-7f8q-9mcj — pypdf: Possible infinite loop when processing threads/articles in writer

2026-10-03T07:29:59.011661+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 threads/articles into a writer.

### Patches

This has been fixed in [pypdf==6.13.1](https://github.com/py-pdf/pypdf/releases/tag/6.13.1).

### Workarounds

If users cannot upgrade yet, consider applying the changes from PR [#3839](https://github.com/py-pdf/pypdf/pull/3839).

PYSEC-2026-3018 — pypdf: Possible infinite loop when processing threads/articles in writer