Bug 2571445 (CVE-2026-97054)

Summary: CVE-2026-97054 net/http: golang: net/http: Denial of Service via race condition when handling oversized HTTP/1 requests
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Go net/http package. When an HTTP/1 server processes a request that exceeds the data limit enforced by MaxBytesReader or MaxBytesHandler, the server attempts to set connection headers without proper synchronization. A remote attacker can exploit this flaw by sending oversized requests to trigger a race condition if the server handler concurrently reads the request body while writing response headers. This timing conflict causes an unhandled panic and crashes the application, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-11-11 03:21:32 UTC 
For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.