Bug 2477113 (CVE-2026-40460)

Summary: CVE-2026-40460 nginx: NGINX: Authorization bypass via IP spoofing in HTTP/3 QUIC module
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in NGINX Plus and NGINX Open Source when configured to use the HTTP/3 QUIC module. A remote attacker could exploit this by spoofing their source IP address. This vulnerability allows for the bypass of authorization controls or rate limiting mechanisms, potentially leading to unauthorized access or resource abuse.
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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: 2481133    
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Description OSIDB Bzimport 2026-05-13 16:04:42 UTC
When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.