CVE-2026-112892: High severity pypi/Pillow vulnerability
Pillow is a Python imaging library. From 4.1.0 until 13.0.0, Pillow's MSP RLE decoder can expand a small file into an unbounded in-memory buffer. The decoder writes run-length output to BytesIO without limiting expansion to the declared image size. An attacker can supply a crafted MSP image to an application that loads its pixels. This can exhaust memory and deny service even when the declared pixel count passes the decompression-bomb check. This issue is fixed in version 13.0.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Pillowto a version that resolves this vulnerability.Fixed in 13.0.0
Event History
Frequently Asked Questions
Which Pillow versions are affected?
Pillow versions from 4.1.0 up to, but not including, 13.0.0 are affected. The issue is fixed in Pillow 13.0.0.
What must an attacker be able to do to exploit this issue?
An attacker must be able to provide a crafted MSP image to an application that loads the image's pixels. No authentication or user interaction is required according to the supplied CVSS vector.
What is the impact if exploitation succeeds?
The crafted image can cause unbounded in-memory expansion and exhaust process memory, resulting in denial of service. The declared pixel count can still pass Pillow's decompression-bomb check.