Bug 2563124 (CVE-2026-118681)

Summary: CVE-2026-118681 github.com/go-chi/chi: chi: Authentication bypass via SuppressNotFound middleware
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, anthomas, aos-team-art-private, asdas, dfreiber, dhanak, doconnor, dpaolell, drosa, drow, dsimansk, eborisov, ehelms, gbenhaim, ggainey, gparvin, jbalunas, jburrell, jcantril, jdelft, jpasqual, jsamir, jupierce, juwatts, kaycoth, kingland, lball, lgarciaa, mbiarnes, mdellweg, mhulan, mnovotny, mwringe, ngough, niyer, nmoumoul, osousa, pcreech, ppalepu, ppostler, prdhamdh, rchan, rhaigner, rhel-process-autobot, rochandr, rojacob, sausingh, sdawley, sghai, sidsharm, smallamp, suppawar, tmalecek, tsze, twaugh, veshanka, vkumar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in chi. An unauthenticated remote attacker can access sensitive information by bypassing authentication controls when the SuppressNotFound middleware is used. Due to improper handling of routing context, requests to a mounted path can be dispatched against outer routes while retaining route parameters and skipping authentication middleware. This vulnerability allows unauthorized attackers to retrieve restricted tenant-scoped data.
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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: 2563278, 2563279, 2563280, 2563281    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-28 19:26:40 UTC 
go-chi chi before 5.5.0 contains an authentication bypass in middleware.SupressNotFound, which calls Match with the live routing context and leaves a mounted router's parameter and child suffix in place for dispatch against the outer router. Unauthenticated attackers can request a mounted path whose suffix matches an outer public route, skipping the mounted authentication middleware and retrieving tenant-scoped data when that outer handler trusts the retained mount parameter.