high7.1
CVE-2026-119207
pypdf has possible large memory usage for exceptions in strict mode
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into very large error messages. This issue is fixed in version 6.21.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.21.3 | 6.21.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Py-Pdf | Pypdf | before 6.21.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4vqv-7265-gm2w
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vqv-7265-gm2w
- https://nvd.nist.gov/vuln/detail/CVE-2026-119207
- https://github.com/py-pdf/pypdf/pull/4265
- https://github.com/py-pdf/pypdf/commit/64270258c0eced720f7960aecf8cef31afd39f8d
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3