Bug 2506521

Summary: CVE-2026-16768 gdk-pixbuf2: out-of-bounds read in ICO parser [fedora-all]
Product: [Fedora] Fedora Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: gdk-pixbuf2Assignee: Adrian Vovk <avovk>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 45CC: avovk, bgilbert, gnome-sig, mclasen
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["ee53baf0-d799-4216-9bcc-cd9b569bdb8c"]}
Fixed In Version: gdk-pixbuf2-2.44.6^really2.44.4-2.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-08-31 17:18:26 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: 2506437    

Description Guilherme de Almeida Suckevicz 2026-07-23 16:38:42 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.

A flaw was found in gdk-pixbuf, affecting all versions. When parsing a specially crafted ICO file with pixel values that exceed the defined palette range, an out-of-bounds read can occur due to improper bounds checking against the actual palette size. This issue causes heap bytes to be interpreted as valid palette indices and rendered as RGB pixel values in the output image, allowing an attacker to extract heap contents via the generated output, such as a thumbnail.

Comment 1 Aoife Moloney 2026-08-17 15:36:18 UTC
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 2 Fedora Update System 2026-08-26 20:24:44 UTC
FEDORA-2026-3f141998cc (gdk-pixbuf2-2.44.8-2.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f141998cc

Comment 3 Fedora Update System 2026-08-26 20:24:50 UTC
FEDORA-2026-461d7d7380 (gdk-pixbuf2-2.44.6^really2.44.4-2.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-461d7d7380

Comment 4 Fedora Update System 2026-08-26 20:24:52 UTC
FEDORA-2026-9c900371cb (gdk-pixbuf2-2.44.6^really2.44.4-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-9c900371cb

Comment 5 Fedora Update System 2026-08-27 01:33:22 UTC
FEDORA-2026-9c900371cb has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-9c900371cb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-9c900371cb

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

Comment 6 Fedora Update System 2026-08-27 01:55:47 UTC
FEDORA-2026-461d7d7380 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-2026-461d7d7380`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-461d7d7380

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

Comment 7 Fedora Update System 2026-08-27 02:13:35 UTC
FEDORA-2026-3f141998cc 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-2026-3f141998cc`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f141998cc

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

Comment 8 Fedora Update System 2026-08-31 17:18:26 UTC
FEDORA-2026-461d7d7380 (gdk-pixbuf2-2.44.6^really2.44.4-2.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-09-01 00:50:23 UTC
FEDORA-2026-f55d6fc9f8 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-f55d6fc9f8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f55d6fc9f8

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

Comment 10 Fedora Update System 2026-09-01 01:29:58 UTC
FEDORA-2026-cf5d926f46 has been pushed to the Fedora 43 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-cf5d926f46`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-cf5d926f46

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