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CVE-2026-112898 Details

Description

Pillow is a Python imaging library. From 9.1.0 until 13.0.0, Pillow can disclose uninitialized stack memory when Image.quantize() uses an empty palette. ImagingPaletteCacheUpdate() leaves a local cache array uninitialized when the palette has zero entries, and the conversion path emits those bytes as output pixel indices. An attacker who controls the palette image can obtain stack contents from a returned PNG or GIF. This can disclose addresses and stack-canary data without an out-of-bounds access, memory corruption, or process crash. This issue is fixed in version 13.0.0.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/python-pillow/Pillow/security/advisories/GHSA-rfgq-q3w2-pmv2	CISA-ADP	ExploitMitigationVendor Advisory
https://github.com/python-pillow/Pillow/commit/13943c8f857b22f073d30f0ef9b725a0d255f1a4	[email protected]	Patch
https://github.com/python-pillow/Pillow/releases/tag/13.0.0	[email protected]	Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-rfgq-q3w2-pmv2	[email protected]	ExploitMitigationVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-457	Use of Uninitialized Variable	[email protected]

Affected Products

Product	Versions
python pillow	>= 9.1.0, < 13.0.0
CPE cpe:2.3:a:python:pillow:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 28, 2026	CVE Modified	CISA-ADP
Oct 27, 2026	Initial Analysis	[email protected]
Oct 19, 2026	New CVE Received	[email protected]