Bug 2560542

Summary: CVE-2026-112892 python-pillow: pillow: Denial of Service via unbounded memory expansion in MSP image decoder [fedora-rawhide]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: python-pillowAssignee: Sandro Mani <manisandro>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: epel-packagers-sig, infra-sig, manisandro, python-packagers-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["d25b49b9-0798-42b9-9b34-bbfa75903194"]}
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Last Closed: 2026-10-26 22:06:55 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2559393    

Description Ronit Dey 2026-10-26 08:25:09 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Sandro Mani 2026-10-26 22:06:55 UTC 
Fixed in Pillow-13.0.0.