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PYSEC-2026-3013

pypdf has a possible infinite loop when processing TreeObject

Quick fix

PYSEC-2026-3013 — pypdf: upgrade to the fixed version with the command below.

pip install --upgrade 'pypdf>=6.7.1'

Details

### 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).

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/pypdf

Introduced in: 0Fixed in: 6.7.1

Fixpip install --upgrade 'pypdf>=6.7.1'

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgq[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2026-27024[ADVISORY]
https://github.com/py-pdf/pypdf/pull/3645[WEB]
https://github.com/py-pdf/pypdf/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295[WEB]
https://github.com/py-pdf/pypdf[PACKAGE]
https://github.com/py-pdf/pypdf/releases/tag/6.7.1[WEB]
https://pypi.org/project/pypdf[PACKAGE]
https://github.com/advisories/GHSA-996q-pr4m-cvgq[ADVISORY]