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GHSA-23w6-3w8w-8484

pypdf: Possible long runtimes/large memory usage when retrieving outlines

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-84310

Packages

EcosystemPackageAffectedFixed in
PyPI pypdf < 6.16.1 6.16.1

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 long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths. ### Patches This has been fixed in [pypdf==6.16.1](https://github.com/py-pdf/pypdf/releases/tag/6.16.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3966](https://github.com/py-pdf/pypdf/pull/3966).

References

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