Bug 2560541

Summary: CVE-2026-112892 python-pillow: pillow: Denial of Service via unbounded memory expansion in MSP image decoder [fedora-44]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: python-pillowAssignee: Sandro Mani <manisandro>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 44CC: 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"]}
Fixed In Version: python-pillow-12.3.0-4.fc44 python-pillow-12.3.0-7.fc45 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-29 01:28:22 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2559393    

Description Ronit Dey 2026-10-26 08:25:00 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 Fedora Update System 2026-10-26 22:05:44 UTC
FEDORA-2026-f860b6ae81 (python-pillow-12.3.0-4.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-f860b6ae81

Comment 2 Fedora Update System 2026-10-26 22:05:45 UTC
FEDORA-2026-4dcd14a170 (python-pillow-12.3.0-4.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4dcd14a170

Comment 3 Fedora Update System 2026-10-27 01:58:07 UTC
FEDORA-2026-4dcd14a170 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-4dcd14a170`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4dcd14a170

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-10-27 02:16:19 UTC
FEDORA-2026-f860b6ae81 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-f860b6ae81`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f860b6ae81

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-10-29 01:28:22 UTC
FEDORA-2026-4dcd14a170 (python-pillow-12.3.0-4.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-10-29 02:02:05 UTC
FEDORA-2026-0e083ad36e has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-0e083ad36e`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-0e083ad36e

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-10-31 05:13:31 UTC
FEDORA-2026-be73b9861d has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-be73b9861d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-be73b9861d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 8 Fedora Update System 2026-11-03 01:11:59 UTC
FEDORA-2026-be73b9861d (python-pillow-12.3.0-7.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.