VDB
CVE-2026-84309
CVE-2026-84309
PUBLISHED
CVSS 6.9 MEDIUM
Reported by GitHub_M · Published September 1, 2026
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.
Risk Scores
CVSS 4.0
6.9
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| py-pdf | pypdf | < 6.16.0 |
| chainguard | open-webui | 0, 0 |
| wolfi | open-webui | 0, 0, 0 |
| PyPI | pypdf | 0 |
| py-pdf | pypdf | < 6.16.0, < 6.16.0, < 6.16.0 |
Timeline
- Sep 1, 2026 CVE Published
- Sep 2, 2026 EPSS Score
- Sep 5, 2026 Security Advisory
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jp53-mhqp-8xcg x_refsource_CONFIRM
- https://github.com/py-pdf/pypdf/pull/3964 x_refsource_MISC
- https://github.com/py-pdf/pypdf/commit/c9ba557d565d57c53a0b3a0be06c0a4c29b0559b x_refsource_MISC
- https://github.com/py-pdf/pypdf/releases/tag/6.16.0 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-84309 advisory
- https://github.com/advisories/GHSA-jp53-mhqp-8xcg advisory