Medium severity5.5NVD Advisory· Published Sep 1, 2026· Updated Oct 5, 2026
CVE-2026-84309
CVE-2026-84309
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.16.0 | 6.16.0 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/py-pdf/pypdf/commit/c9ba557d565d57c53a0b3a0be06c0a4c29b0559bnvdPatchWEB
- github.com/py-pdf/pypdf/pull/3964nvdPatchWEB
- github.com/py-pdf/pypdf/security/advisories/GHSA-jp53-mhqp-8xcgnvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-jp53-mhqp-8xcgghsaADVISORY
- github.com/py-pdf/pypdf/releases/tag/6.16.0nvdRelease NotesWEB
News mentions
0No linked articles in our index yet.