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GHSA-fp3f-mc75-235c

pypdf: Possible large memory usage for large /ToUnicode streams

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-71870

Packages

EcosystemPackageAffectedFixed in
PyPI pypdf < 6.15.0 6.15.0

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 parsing the `/ToUnicode` entry of a font with unusually large values, for example during text extraction. ### Patches This has been fixed in [pypdf==6.15.0](https://github.com/py-pdf/pypdf/releases/tag/6.15.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3944](https://github.com/py-pdf/pypdf/pull/3944).

References

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