pypdf: Possible long runtimes/large memory usage when retrieving form fields

影響: pip:pypdf < 6.21.0 → 6.21.0

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document. Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4219](https://github.com/py-pdf/pypdf/pull/4219).

Read on GitHub Advisory Database

On 10/23/2026, 01:49 AM, GitHub Advisory Database published "pypdf: Possible long runtimes/large memory usage when retrieving form fields" (type: Advisory). Severity is "Medium" (medium). Related technologies: Python, GitHub. CVE: CVE-2026-113789.