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PYSEC-2026-1827
pypdf has possible Infinite Loop when processing outlines/bookmarks
Quick fix
PYSEC-2026-1827 — pypdf: upgrade to the fixed version with the command below.
pip install --upgrade 'pypdf>=6.6.2'Details
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks.
### Patches
This has been fixed in [pypdf 6.6.2](https://github.com/py-pdf/pypdf/releases/tag/6.6.2).
### Workarounds
If projects cannot upgrade yet, consider applying the changes from PR [#3610](https://github.com/py-pdf/pypdf/pull/3610).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-24688[ADVISORY]
- https://github.com/py-pdf/pypdf/pull/3610[WEB]
- https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1[WEB]
- https://github.com/py-pdf/pypdf[PACKAGE]
- https://github.com/py-pdf/pypdf/releases/tag/6.6.2[WEB]
- https://pypi.org/project/pypdf[PACKAGE]
- https://github.com/advisories/GHSA-2q4j-m29v-hq73[ADVISORY]