---
title: "CVE-2026-96778: Pillow - Buffer Overflow"
description: "Pillow 9.4.0 to 13.0.0 contains a heap buffer overflow caused by jpeg_write_marker() writing beyond buffer limits in JpegEncode.c when processing JPEG COM comments with exact 65536-byte ICC profiles, letting attackers overwrite adjacent heap memory and potentially execute code, exploit requires crafted JPEG image with specific ICC profile and comment."
url: https://panop.io/threat-heartbeat/CVE-2026-96778/
---

# CVE-2026-96778 Pillow - Buffer Overflow

Pillow 9.4.0 to 13.0.0 contains a heap buffer overflow caused by jpeg\_write\_marker() writing beyond buffer limits in JpegEncode.c when processing JPEG COM comments with exact 65536-byte ICC profiles, letting attackers overwrite adjacent heap memory and potentially execute code, exploit requires crafted JPEG image with specific ICC profile and comment.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-96778)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/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-787](https://cwe.mitre.org/data/definitions/787.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-2026-96778](https://nvd.nist.gov/vuln/detail/CVE-2026-96778)
- [https://github.com/python-pillow/Pillow/pull/10124](https://github.com/python-pillow/Pillow/pull/10124)
- [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-g7cr-3p24-7wf7](https://github.com/python-pillow/Pillow/security/advisories/GHSA-g7cr-3p24-7wf7)
- [https://github.com/python-pillow/Pillow/commit/02561b8dc6117d5670d4b469fecdd02c70854f9b](https://github.com/python-pillow/Pillow/commit/02561b8dc6117d5670d4b469fecdd02c70854f9b)

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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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