MEDIUM GitHub
CVE-2026-113794
pypdf: Possible infinite loop when hitting EOF in standard xref table
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table.
### Patches
This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#4170](https://github.com/py-pdf/pypdf/pull/4170).
### Notes
This has been reported through both the secure channel and as a public issue a
Affected Products
- pip/pypdf < 6.20.0
References
- https://github.com/advisories/GHSA-39mj-jf6j-2qj3
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3
- https://github.com/py-pdf/pypdf/issues/4169
- https://github.com/py-pdf/pypdf/pull/4170
This medium severity vulnerability was published on 2026-10-21 via GitHub. Affected: pip/pypdf < 6.20.0.
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