Bug 2533681

Summary: CVE-2026-91786 gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvalidated icon-data buffer size [fedora-all]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: gnome-shellAssignee: GNOME SIG Unassigned <gnome-sig>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: adscvr, development.group, fmuellner, gnome-sig, jadahl, otaylor
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["63741c0e-c28a-4319-b03b-548faf15bd5c"]}
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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: 2533606    

Description Vladimir Vasilev 2026-09-15 10:47:56 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 GNOME Shell's remote search integration. When rendering an icon supplied by a remote search provider over D-Bus, the icon's declared width, height, and row stride are passed to Shell.util_create_pixbuf_from_data() without validating that this geometry is consistent with the actual size of the supplied data buffer. A malicious or compromised search provider can advertise icon dimensions larger than its actual buffer, causing GNOME Shell to read past the end of the buffer when constructing the pixbuf for display. This out-of-bounds read can crash the GNOME Shell process, disrupting the user's session, and could potentially expose adjacent heap memory contents through the rendered icon.