CVE-2026-41313
pypdf: Possible long runtimes for wrong size values in incremental mode
- State
- Published
- Severity
- 4.8 Medium
- Published
- Apr 22, 2026
- Updated
- Apr 23, 2026
- Reserved
- Apr 20, 2026
Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-834 Excessive Iteration
Affected Products
| Product | Versions |
|---|---|
pypdfpy-pdf |
|
References
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