Bug 2526955 (CVE-2026-84304)

Summary: CVE-2026-84304 google.golang.org/grpc: gRPC-Go: Denial of Service via HTTP/2 DATA Frame Fragmentation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abuckta, akhatavk, aos-team-art-private, asdas, asyoung, dkuc, dpaolell, gparvin, jbalunas, jcantril, jdelft, jhollowa, jupierce, kaycoth, lgarciaa, mbiarnes, mstipich, mwringe, orabin, ppalepu, ppostler, prdhamdh, prichard, rexwhite, rhaigner, rojacob, sghai, sidsharm, sthirugn, suppawar, tsze, vlaad
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in gRPC-Go. This vulnerability allows an unauthenticated remote attacker to exhaust process memory by sending millions of fragmented HTTP/2 DATA frames. Each fragmented frame is stored as a separate message, consuming disproportionate heap memory. This can lead to a runtime panic or out-of-memory termination, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-01 18:42:16 UTC 
gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, internal/transport/transport.go stores each fragmented HTTP/2 DATA frame as a separate recvMsg in recvBuffer, so millions of one-byte frames can consume disproportionate heap memory even when payload bytes remain within connection and stream flow-control windows. An unauthenticated remote attacker can use concurrent multiplexed streams to exhaust process memory and cause a runtime panic or out-of-memory termination. Receive-buffer compaction is enabled by default and can be controlled temporarily with GRPC_GO_EXPERIMENTAL_ENABLE_RECEIVE_BUFFER_COMPACTION. This issue is fixed in version 1.83.1.