---
title: "CVE-2026-112406: Pillow - Denial of Service"
description: "Pillow 5.1.0 to 13.0.0 contains a denial of service caused by infinite loop in PdfParser.rewrite_pages() due to cyclic Parent relationships in PDF page tree, letting attackers cause CPU exhaustion, exploit requires crafted cyclic PDF."
url: https://panop.io/threat-heartbeat/CVE-2026-112406/
---

# CVE-2026-112406 Pillow - Denial of Service

Pillow 5.1.0 to 13.0.0 contains a denial of service caused by infinite loop in PdfParser.rewrite\_pages() due to cyclic Parent relationships in PDF page tree, letting attackers cause CPU exhaustion, exploit requires crafted cyclic PDF.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-112406)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

19 October 2026

Updated

20 October 2026

Weakness

[CWE-835](https://cwe.mitre.org/data/definitions/835.html)

## Vendor fix

Update to version 13.0.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-112406](https://nvd.nist.gov/vuln/detail/CVE-2026-112406)
- [https://github.com/python-pillow/Pillow/releases/tag/13.0.0](https://github.com/python-pillow/Pillow/releases/tag/13.0.0)
- [https://github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58](https://github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58)
- [https://github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777](https://github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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