Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pypdf Project | Pypdf | < 6.12.0 |
Related Weaknesses (CWE)
References
- https://github.com/py-pdf/pypdf/pull/3791Issue TrackingPatch
- https://github.com/py-pdf/pypdf/releases/tag/6.12.0Release Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6PatchVendor Advisory
FAQ
What is CVE-2026-48156?
CVE-2026-48156 is a vulnerability with a CVSS score of 3.3 (LOW). pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams wi...
How severe is CVE-2026-48156?
CVE-2026-48156 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48156?
Check the references section above for vendor advisories and patch information. Affected products include: Pypdf Project Pypdf.