high7.5
CVE-2026-112406
Pillow: Infinite loop in PdfParser.rewrite_pages on page tree Parent cycle
Impact
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow can enter an infinite loop while rewriting PDF pages. PdfParser.rewrite_pages() follows Parent relationships without detecting a cycle in the page tree. An attacker can supply a cyclic PDF to an application that appends an image to that PDF. This can hold the worker at full CPU and deny service. This issue is fixed in version 13.0.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | Pillow | >= 5.1.0, < 13.0.0 | 13.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Pillow | from 5.1.0 before 13.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-f2g6-542v-9j58
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58
- https://nvd.nist.gov/vuln/detail/CVE-2026-112406
- https://github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0