Bug 2509703

Summary: CVE-2026-5056 xdg-desktop-portal-cosmic: GStreamer: Arbitrary code execution via stack-based buffer overflow in qtdemux [fedora-all]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: xdg-desktop-portal-cosmicAssignee: Ryan Brue <ryanbrue.dev>
Status: CLOSED CANTFIX QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: cosmic-sig, decathorpe, rust-sig, ryanbrue.dev
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a1933dd0-d89f-437b-8253-080849ee920a"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-08-11 10:34:40 UTC Type: ---
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Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2173769, 2508623    

Description Srikanth Balasubramanian 2026-07-31 07:03:04 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.

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the parsing of UncompressedFrameConfigBox structures. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29392.
Comment 1 Fabio Valentini 2026-08-11 10:34:40 UTC 
This is a bug in GStreamer, which this package *links* to, but does not itself include.
So this bug needs to be fixed elsewhere and nothing can be done here.