Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.
Severity (CVSS)
| Base score | 6.9 |
|---|---|
| Severity | Medium |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| Provided by | CNA |
Weaknesses
- CWE-835 — CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Affected products
| Vendor | Product | Versions |
|---|---|---|
| py-pdf | pypdf | < 6.13.1 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcj (x_refsource_CONFIRM)
- https://github.com/py-pdf/pypdf/pull/3839 (x_refsource_MISC)
- https://github.com/py-pdf/pypdf/releases/tag/6.13.1 (x_refsource_MISC)
Generated from the official CVE List on 23 Jun 2026 10:05 UTC.