Bug 2515006 (CVE-2026-73501)

Summary: CVE-2026-73501 github.com/getkin/kin-openapi: kin-openapi: kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akhatavk, akostadi, amasferr, amctagga, anjoseph, ansmith, aoconnor, aos-team-art-private, asdas, asyoung, bniver, crizzo, dfreiber, dhanak, dmayorov, dpaolell, drosa, drow, dsimansk, eglynn, flucifre, gmeno, gparvin, groman, jbritton, jburrell, jdelft, jhollowa, jjoyce, jlledo, jprabhak, jpretori, jsamir, jschluet, jsherril, jupierce, kaycoth, kingland, lchilton, lgarciaa, lhh, mbenjamin, mbiarnes, mburns, mgarciac, mhackett, mnovotny, orabin, pantinor, pjindal, ppalepu, ppostler, prdhamdh, prichard, rhaigner, rhel-process-autobot, rjohnson, rochandr, sausingh, sfeifer, sghai, sidsharm, sostapov, sthirugn, suppawar, tsedmik, vereddy, vkumar, vlaad, watson-tool-maintainers, wtam
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in kin-openapi. This vulnerability allows a remote attacker to bypass authentication checks. Specifically, the system incorrectly handles missing authentication configurations, substituting them with a function that does not verify user credentials. This enables unauthorized access to protected resources that should require proper authentication, compromising the application's security.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-12 21:41:26 UTC 
kin-openapi is a Go project for handling OpenAPI files. Prior to 0.144.0, ValidationHandler.Load() in openapi3filter/validation_handler.go silently replaces a nil AuthenticationFunc with NoopAuthenticationFunc, which returns nil without checking credentials. This substitution causes every OpenAPI security requirement to be satisfied for unauthenticated requests when an application relies on ValidationHandler as its enforcement middleware. The no-op callback prevents the fail-closed ErrAuthenticationServiceMissing path from being reached and forwards the request to protected handlers that may require an API key, OAuth token, or another security scheme. This issue is fixed in version 0.144.0.