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PYSEC-2026-1833

pypdf possibly loops infinitely when reading DCT inline images without EOF marker

Quick fix

PYSEC-2026-1833 — pypdf: upgrade to the fixed version with the command below.

pip install --upgrade 'pypdf>=6.1.3'

Details

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page which has an inline image using the DCTDecode filter.

### Patches This has been fixed in [pypdf==6.1.3](https://github.com/py-pdf/pypdf/releases/tag/6.1.3).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3501](https://github.com/py-pdf/pypdf/pull/3501).

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/pypdf

Introduced in: 0Fixed in: 6.1.3

Fixpip install --upgrade 'pypdf>=6.1.3'

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-vr63-x8vc-m265[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2025-62707[ADVISORY]
https://github.com/py-pdf/pypdf/pull/3501[WEB]
https://github.com/py-pdf/pypdf/commit/f2864d6dd9bac7cecd3f4f54308b25ebbfa178f8[WEB]
https://github.com/py-pdf/pypdf[PACKAGE]
https://github.com/py-pdf/pypdf/releases/tag/6.1.3[WEB]
https://pypi.org/project/pypdf[PACKAGE]
https://github.com/advisories/GHSA-vr63-x8vc-m265[ADVISORY]