Bug 2571527

Summary: CVE-2026-125118 smplayer: Mongoose: Security bypass via prototype pollution in virtual schema paths [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: smplayerAssignee: Michel Lind <michel>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel9CC: davide, multimedia-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["f2592e57-2639-4603-9e80-29ba5ecb7ad4"]}
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Clone Of: Environment:
Last Closed: 2026-11-11 18:42:56 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: 2449640, 2487042, 2570206    

Description Vladimir Vasilev 2026-11-11 08:10:56 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.

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.12, 7.8.13, 8.24.7, and 9.11.4, Schema.prototype.virtual() builds nested virtual paths without applying the special-property validation already used by Schema.path() and Schema.add(). An attacker who can influence virtual field names in dynamic schemas, content-management form builders, or schema-as-code systems can supply path segments such as __proto__, constructor, or prototype, causing the virtual-path reducer to write enumerable properties to Object.prototype or Function.prototype. The resulting prototype pollution can spoof inherited property checks such as authorization flags and can provide function-prototype gadget state to other server-side JavaScript code. This issue is fixed in versions 6.13.12, 7.8.13, 8.24.7, and 9.11.4.
Comment 1 Michel Lind 2026-11-11 17:40:02 UTC 
Reassigning from `epel10` to `epel9`: Bug filed against a branch the package never shipped on.
Comment 2 Michel Lind 2026-11-11 18:42:56 UTC 
This CVE is for a different package in a different ecosystem that happens to share a similar name

CVE-2026-125118 is in a different project from Fedora's smplayer:
- smplayer in Fedora: A graphical frontend for mplayer and mpv, not a JavaScript package
- smplayer also declares bundled(mongoose) = 6.11: a copy of another mongoose, built into a package that is not JavaScript
- CVE-2026-125118: Automattic/mongoose, a JavaScript project. Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment.