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CVE-2026-27628 — pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

2026-09-28T07:52:57.398538+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply the patch manually.

GHSA-2rw7-x74f-jg35 — pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

2026-09-28T07:52:57.398640+00:00

Affected: PyPI: pypdf

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file.

### Patches

This has been fixed in [pypdf==6.7.2](https://github.com/py-pdf/pypdf/releases/tag/6.7.2).

### Workarounds

If users cannot upgrade yet, consider applying the changes from PR [#3655](https://github.com/py-pdf/pypdf/pull/3655).

PYSEC-2026-3005 — pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams