Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pypdf Project | Pypdf | < 6.21.3 |
Related Weaknesses (CWE)
References
- https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4Patch
- https://github.com/py-pdf/pypdf/pull/4269Patch
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3Release Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqcPatchVendor Advisory
FAQ
What is CVE-2026-119209?
CVE-2026-119209 is a vulnerability with a CVSS score of 5.5 (MEDIUM). pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entr...
How severe is CVE-2026-119209?
CVE-2026-119209 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-119209?
Check the references section above for vendor advisories and patch information. Affected products include: Pypdf Project Pypdf.