high7.1
CVE-2026-119204
pypdf has possible large memory usage when parsing page tree
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can consume excessive memory while parsing a crafted PDF page tree containing many shared resources. Page-tree flattening copies page dictionary and inherited resource entries without a document-wide entry budget, allowing the crafted resource structure to cause disproportionate allocations. This issue is fixed in version 6.21.4.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.21.4 | 6.21.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Py-Pdf | Pypdf | before 6.21.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-cggf-277g-3q54
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54
- https://nvd.nist.gov/vuln/detail/CVE-2026-119204
- https://github.com/py-pdf/pypdf/pull/4290
- https://github.com/py-pdf/pypdf/commit/ea4ac663133f1b3de1d7a8f2e6fa239802fde79e
- https://github.com/py-pdf/pypdf/releases/tag/6.21.4