---
title: "CVE-2026-112393: Pillow - Buffer Overflow"
description: "Pillow 2.0.0 to 13.0.0 contains a heap buffer overflow and stale-heap disclosure caused by incorrect allocation sizing in _tiffWriteProc when saving compressed TIFF data to targets without usable fileno(), letting attackers cause crashes or code execution, exploit requires saving TIFF to non-file targets like BytesIO."
url: https://panop.io/threat-heartbeat/CVE-2026-112393/
---

# CVE-2026-112393 Pillow - Buffer Overflow

Pillow 2.0.0 to 13.0.0 contains a heap buffer overflow and stale-heap disclosure caused by incorrect allocation sizing in \_tiffWriteProc when saving compressed TIFF data to targets without usable fileno(), letting attackers cause crashes or code execution, exploit requires saving TIFF to non-file targets like BytesIO.

CVSS base score 9.2 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-112393)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service, Information Disclosure

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/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

19 October 2026

Updated

20 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.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-2026-112393](https://nvd.nist.gov/vuln/detail/CVE-2026-112393)
- [https://github.com/python-pillow/Pillow/commit/11582e5ffbdceb973d5ee593f3105af5a9852b40](https://github.com/python-pillow/Pillow/commit/11582e5ffbdceb973d5ee593f3105af5a9852b40)
- [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-332p-7hrc-92wf](https://github.com/python-pillow/Pillow/security/advisories/GHSA-332p-7hrc-92wf)

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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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