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PYSEC-2026-3016

pypdf: Possible large memory usage for large offsets for layout mode text

Quick fix

PYSEC-2026-3016 — pypdf: upgrade to the fixed version with the command below.

pip install --upgrade 'pypdf>=6.12.0'

Details

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets.

### Patches

This has been fixed in [pypdf==6.12.0](https://github.com/py-pdf/pypdf/releases/tag/6.12.0).

### Workarounds

If developers are unable to immediately upgrade, they should consider applying the changes from PR [#3790](https://github.com/py-pdf/pypdf/pull/3790).

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/pypdf

Introduced in: 0Fixed in: 6.12.0

Fixpip install --upgrade 'pypdf>=6.12.0'

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-cj93-chg6-vgv8[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2026-48155[ADVISORY]
https://github.com/py-pdf/pypdf/pull/3790[WEB]
https://github.com/py-pdf/pypdf[PACKAGE]
https://github.com/py-pdf/pypdf/releases/tag/6.12.0[WEB]
https://pypi.org/project/pypdf[PACKAGE]
https://github.com/advisories/GHSA-cj93-chg6-vgv8[ADVISORY]