CVE-2026-112406

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777	Patch
https://github.com/python-pillow/Pillow/releases/tag/13.0.0	Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58	Exploit Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*

History

27 Oct 2026, 14:59

Type	Values Removed	Values Added
References	~~() https://github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777 -~~	() https://github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777 - Patch
References	~~() https://github.com/python-pillow/Pillow/releases/tag/13.0.0 -~~	() https://github.com/python-pillow/Pillow/releases/tag/13.0.0 - Release Notes
References	~~() https://github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58 -~~	() https://github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58 - Exploit, Mitigation, Patch, Vendor Advisory
First Time		Python Python pillow
CPE		cpe:2.3:a:python:pillow::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

19 Oct 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-19 22:17

Updated : 2026-10-27 14:59

NVD link : CVE-2026-112406

Mitre link : CVE-2026-112406

CVE.ORG link : CVE-2026-112406

JSON object : View

Products Affected

python

pillow

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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