Answer in brief
CVE-2026-121809 records a High severity (CVSS 8.2) vulnerability in CPU exhaustion via a truncated gRPC message on streaming RPCs in elixir-grpc grpc_server. The current sources do not mark it as known exploited. The current feed maps elixir-grpc/elixir-grpc/grpc (generic), elixir-grpc/elixir-grpc/grpc (generic), elixir-grpc/grpc (generic), elixir-grpc/grpc_server (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps elixir-grpc/elixir-grpc/grpc (generic), elixir-grpc/elixir-grpc/grpc (generic), elixir-grpc/grpc (generic), elixir-grpc/grpc_server (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| elixir-grpc/elixir-grpc/grpcgeneric | >=0332faae5f5e132314794dbfdae5edecbccea292 <38955f1392cbf08eef231a347348445410455c85 | 38955f1392cbf08eef231a347348445410455c85 |
| elixir-grpc/elixir-grpc/grpcgeneric | >=6d8a09ad919e208fb600538ac8b19bd733a04310 <0332faae5f5e132314794dbfdae5edecbccea292 | 0332faae5f5e132314794dbfdae5edecbccea292 |
| elixir-grpc/grpcgeneric | >=0.3.1 <1.0.0 | 1.0.0 |
| elixir-grpc/grpc_servergeneric | >=1.0.0 <1.1.0 | 1.1.0 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in elixir-grpc grpc_server and grpc allows unauthenticated attackers to occupy a BEAM scheduler indefinitely via a client-streaming or bidirectional-streaming request whose body ends inside a gRPC message. GRPC.Server.Adapters.Cowboy.read_stream/1 (grpc_server/lib/grpc/server/adapters/cowboy.ex, and the Cowboy adapter in grpc before the package split) asks for more data whenever the buffer does not hold a complete message. Once the request body has ended, every further read returns an empty chunk, so the buffer never changes and the function retries without end. A single 5-byte length prefix sent with END_STREAM keeps one scheduler busy for as long as the connection stays open, and repeated requests exhaust all schedulers. This issue affects grpc_server: from 1.0.0 before 1.1.0; grpc: from 0.3.1 before 1.0.0.
Quoted source text, attributed separately from HOL analysis.