---
title: "CVE-2026-96644: Pillow - Heap Buffer Overflow"
description: "Pillow < 13.0.0 on Windows contains a heap buffer overflow caused by unchecked 32-bit WMF/EMF dimensions passed to the native drawwmf handler, letting attackers cause memory disclosure or crash, exploit requires crafted metafile."
url: https://panop.io/threat-heartbeat/CVE-2026-96644/
---

# CVE-2026-96644 Pillow - Heap Buffer Overflow

Pillow < 13.0.0 on Windows contains a heap buffer overflow caused by unchecked 32-bit WMF/EMF dimensions passed to the native drawwmf handler, letting attackers cause memory disclosure or crash, exploit requires crafted metafile.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-96644)

## Details

Type

Heap Buffer Overflow

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/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

21 October 2026

Updated

22 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.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-2026-96644](https://nvd.nist.gov/vuln/detail/CVE-2026-96644)
- [https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7](https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7)
- [https://github.com/python-pillow/Pillow/pull/10120](https://github.com/python-pillow/Pillow/pull/10120)
- [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-9v9v-9qvf-h2hj](https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj)

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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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