pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.
History

Wed, 04 Mar 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Bigcat88 pillow-heif
CPEs cpe:2.3:a:bigcat88:pillow-heif:*:*:*:*:*:python:*:*
Vendors & Products Bigcat88 pillow-heif
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}


Tue, 03 Mar 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 02 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Bigcat88
Bigcat88 pillow Heif
Vendors & Products Bigcat88
Bigcat88 pillow Heif

Fri, 27 Feb 2026 20:30:00 +0000

Type Values Removed Values Added
Description pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.
Title pillow_heif Has Integer Overflow in Encode Path Buffer Validation that Leads to Heap Out-of-Bounds Read
Weaknesses CWE-125
CWE-190
References
Metrics cvssV4_0

{'score': 5.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-02-27T20:13:45.195Z

Updated: 2026-03-03T20:25:30.145Z

Reserved: 2026-02-25T15:28:40.651Z

Link: CVE-2026-28231

cve-icon Vulnrichment

Updated: 2026-03-03T20:25:27.680Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-27T20:21:40.697

Modified: 2026-03-04T15:55:20.027

Link: CVE-2026-28231

cve-icon Redhat

No data.