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GHSA-7mh2-4gg2-979f

pypdf: Possible large memory usage for streams with multiple filters

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-113795

Packages

EcosystemPackageAffectedFixed in
PyPI pypdf < 6.20.0 6.20.0

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 large memory consumption. This requires accessing any stream with a large amount of filters or multiple filters which pass around large amounts of data. ### Patches This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4173](https://github.com/py-pdf/pypdf/pull/4173).

References

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