{"cve":"CVE-2026-84304","nvd":{"published":"2026-09-01T19:17:30.743","modified":"2026-09-09T21:09:13.080","status":"Deferred","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":null,"cwes":["CWE-400"],"references":["https://github.com/grpc/grpc-go/commit/7354d9c8debb4bcf2225bf429857078de310c176","https://github.com/grpc/grpc-go/commit/8cfeca0e1ee5ea0980dcc320e20240fa1079ec77","https://github.com/grpc/grpc-go/pull/9331","https://github.com/grpc/grpc-go/pull/9333","https://github.com/grpc/grpc-go/releases/tag/v1.83.1"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-84304","score":0.00609,"percentile":0.49155,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vp52-pcj8-j9qc","url":"https://osv.dev/vulnerability/GHSA-vp52-pcj8-j9qc","summary":"gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation","modified":"2026-09-15T19:10:44.560975305Z","packages":[{"ecosystem":"Go","name":"google.golang.org/grpc","purl":"pkg:golang/google.golang.org/grpc","ranges":["<1.83.1"],"fixed":["1.83.1"]}]},{"id":"GO-2026-6348","url":"https://osv.dev/vulnerability/GO-2026-6348","summary":"Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation in google.golang.org/grpc","modified":"2026-09-15T19:00:16.944663241Z","packages":[{"ecosystem":"Go","name":"google.golang.org/grpc","purl":"pkg:golang/google.golang.org/grpc","ranges":["<1.83.1"],"fixed":["1.83.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}