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PYSEC-2026-3005
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
Quick fix
PYSEC-2026-3005 — pypdf: upgrade to the fixed version with the command below.
pip install --upgrade 'pypdf>=6.7.2'Details
### 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).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-27628[ADVISORY]
- https://github.com/py-pdf/pypdf/issues/3654[WEB]
- https://github.com/py-pdf/pypdf/commit/f0a462d36971cf077d74492a348d0d06fd60ea4d[WEB]
- https://github.com/py-pdf/pypdf[PACKAGE]
- https://pypi.org/project/pypdf[PACKAGE]
- https://github.com/advisories/GHSA-2rw7-x74f-jg35[ADVISORY]