GHSA-996q-pr4m-cvgq

pypdf has a possible infinite loop when processing TreeObject

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-27024

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.7.1	6.7.1

Details

As written in the advisory (Markdown source, shown as plain text).

### 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).

References

External links from the advisory. They lead to third-party sites.

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