GHSA-4pxv-j86v-mhcw

pypdf: Possible long runtimes for wrong size values in incremental mode

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-41313

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.10.2	6.10.2

Details

As written in the advisory (Markdown source, shown as plain text).

### 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).

References

External links from the advisory. They lead to third-party sites.

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