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PYSEC-2026-3020

pypdf: Possible large memory usage for form XObjects during text extraction

Quick fix

PYSEC-2026-3020 — pypdf: upgrade to the fixed version with the command below.

pip install --upgrade 'pypdf>=6.12.2'

Details

### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references.

### Patches This has been fixed in [pypdf==6.12.2](https://github.com/py-pdf/pypdf/releases/tag/6.12.2).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3805](https://github.com/py-pdf/pypdf/pull/3805).

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/pypdf

Introduced in: 0Fixed in: 6.12.2

Fixpip install --upgrade 'pypdf>=6.12.2'

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-j543-4vmf-qm7v[WEB]
https://github.com/py-pdf/pypdf/pull/3805[WEB]
https://github.com/py-pdf/pypdf[PACKAGE]
https://github.com/py-pdf/pypdf/releases/tag/6.12.2[WEB]
https://pypi.org/project/pypdf[PACKAGE]
https://github.com/advisories/GHSA-j543-4vmf-qm7v[ADVISORY]
https://nvd.nist.gov/vuln/detail/CVE-2026-49461[ADVISORY]