---
title: "CVE-2026-96639: Pillow - Buffer Overflow"
description: "Pillow 11.0.0 to 13.0.0 contains a buffer overflow caused by stale ImagingCore allocation reuse in multi-frame loaders, letting attackers cause out-of-bounds writes, crashes, and potential command execution via crafted frames."
url: https://panop.io/threat-heartbeat/CVE-2026-96639/
---

# CVE-2026-96639 Pillow - Buffer Overflow

Pillow 11.0.0 to 13.0.0 contains a buffer overflow caused by stale ImagingCore allocation reuse in multi-frame loaders, letting attackers cause out-of-bounds writes, crashes, and potential command execution via crafted frames.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-96639)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service, Out Of Bounds Rw

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-2026-96639](https://nvd.nist.gov/vuln/detail/CVE-2026-96639)
- [https://github.com/python-pillow/Pillow/commit/78d97d994579aef81aafe123773d525f40f2522a](https://github.com/python-pillow/Pillow/commit/78d97d994579aef81aafe123773d525f40f2522a)
- [https://github.com/python-pillow/Pillow/pull/10105](https://github.com/python-pillow/Pillow/pull/10105)
- [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-v9pv-5gc8-w2m6](https://github.com/python-pillow/Pillow/security/advisories/GHSA-v9pv-5gc8-w2m6)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)