MEDIUM6.5
PYSEC-2026-3007
pypdf: Possible long runtimes for wrong size values in incremental mode
Quick fix
PYSEC-2026-3007 — pypdf: upgrade to the fixed version with the command below.
pip install --upgrade 'pypdf>=6.10.2'Details
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode.
### Patches This has been fixed in [pypdf==6.10.2](https://github.com/py-pdf/pypdf/releases/tag/6.10.2).
### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3735](https://github.com/py-pdf/pypdf/pull/3735).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcw[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-41313[ADVISORY]
- https://github.com/py-pdf/pypdf/pull/3735[WEB]
- https://github.com/py-pdf/pypdf/commit/c50a0104cf083356f7c7f5d61410466a57f5c88a[WEB]
- https://github.com/py-pdf/pypdf[PACKAGE]
- https://github.com/py-pdf/pypdf/releases/tag/6.10.2[WEB]
- https://pypi.org/project/pypdf[PACKAGE]
- https://github.com/advisories/GHSA-4pxv-j86v-mhcw[ADVISORY]