GHSA-7gw9-cf7v-778f

pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-41312

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 the RAM being exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters. ### 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 [#3734](https://github.com/py-pdf/pypdf/pull/3734).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-7gw9-cf7v-778f web
https://nvd.nist.gov/vuln/detail/CVE-2026-41312 advisory
https://github.com/py-pdf/pypdf/pull/3734 web
https://github.com/py-pdf/pypdf/commit/ac734dab4eef92bcce50d503949b4d9887d89f11 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.10.2 web