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CVE-2026-112406Pillow: Infinite loop in PdfParser.rewrite_pages on page tree Parent cycle
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.
8.7 HIGHEPSS 0.57%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.7 | HIGH | 4.0GitHub_M (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 7.5 | HIGH | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-112406
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Oct 19, 2026
- Last modified
- 2026-10-27 14:59 UTC
- Weaknesses
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Products
As published by the CNA in the CVE record.
python-pillowPillow1 version range
- >= 5.1.0, < 13.0.0