[GHSA] GHSA-jp53-mhqp-8xcg (medium) — pypdf: Possible infinite loop for TreeObject.insert_child

GHSA-jp53-mhqp-8xcg Severity: medium CVE: CVE-2026-84309

pypdf: Possible infinite loop for TreeObject.insert_child

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires a (usually writing) code path where `TreeObject.insert_child` is involved.

### Patches

This has been fixed in [pypdf==6.16.0](https://github.com/py-pdf/pypdf/releases