CVE-2026-112396

Pillow is a Python imaging library. From 11.3.0 until 13.0.0, Pillow has a heap use-after-free when libtiff rejects a tag while encoding TIFF data to an in-memory buffer. When an application saves attacker-influenced TIFF tags to BytesIO, libtiff can reject a tag during encoding in ImagingLibTiffEncode; the error path then frees the output buffer without closing or clearing the TIFF handle, and later cleanup flushes through the write callback into freed memory, which can crash the process and may enable code execution. This issue is fixed in version 13.0.0.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

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/dc95da20207827a062cfbf551ee9f6031465a8bb	Patch
https://github.com/python-pillow/Pillow/releases/tag/13.0.0	Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rr5-89j8-mwwm	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

26 Oct 2026, 21:00

Type	Values Removed	Values Added
CPE		cpe:2.3:a:python:pillow::::::::
First Time		Python Python pillow
References	~~() https://github.com/python-pillow/Pillow/commit/dc95da20207827a062cfbf551ee9f6031465a8bb -~~	() https://github.com/python-pillow/Pillow/commit/dc95da20207827a062cfbf551ee9f6031465a8bb - 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-4rr5-89j8-mwwm -~~	() https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rr5-89j8-mwwm - Exploit, Vendor Advisory

19 Oct 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-19 22:17

Updated : 2026-10-26 21:00

NVD link : CVE-2026-112396

Mitre link : CVE-2026-112396

CVE.ORG link : CVE-2026-112396

JSON object : View

Products Affected

python

pillow

CWE

CWE-416

Use After Free

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