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Back to active CVEs
High · CVSS 8.2CVE-2026-124279

Streaming request body limit enforced only after an 8 MB read in elixir-grpc grpc_serverCVE-2026-124279

Answer in brief

CVE-2026-124279 records a High severity (CVSS 8.2) vulnerability in Streaming request body limit enforced only after an 8 MB read 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/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.

Published Nov 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.2
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

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.

Affected scope and exposure questions

The current feed maps elixir-grpc/elixir-grpc/grpc (generic), elixir-grpc/grpc_server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
elixir-grpc/elixir-grpc/grpcgeneric>=49e18c3ec6bb9afe2f712caad3dbab5c56a68a00 <b1e771d558941b1ed4b6de8b39f6a5375543db01b1e771d558941b1ed4b6de8b39f6a5375543db01
elixir-grpc/grpc_servergeneric>=1.0.0 <1.1.01.1.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for elixir-grpc/elixir-grpc/grpc, elixir-grpc/grpc_server.
  2. 2Review the reported fix. Update elixir-grpc/elixir-grpc/grpc to b1e771d558941b1ed4b6de8b39f6a5375543db01; elixir-grpc/grpc_server to 1.1.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 13, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source description

Allocation of Resources Without Limits or Throttling vulnerability in elixir-grpc grpc_server allows unauthenticated attackers to exhaust server memory via client-streaming or bidirectional-streaming requests. The streaming read clause of GRPC.Server.Adapters.Cowboy.Handler.info/3 (grpc_server/lib/grpc/server/adapters/cowboy/handler.ex) asks Cowboy for up to 8,000,000 bytes per read and compares the running total with max_body_size only after the read returns. The gRPC length prefix of a message is not checked before the message is buffered. Each stream can therefore buffer up to one full read beyond the configured limit before it is refused, and many concurrent streams exhaust node memory. Releases before 1.0.6 apply no limit to streaming requests at all. This issue affects grpc_server: from 1.0.0 before 1.1.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Memory exhaustion via compressed Erlang terms in the elixir-grpc Erlpack codecSame elixir-grpc/elixir-grpc/grpc package
  • CPU exhaustion via a truncated gRPC message on streaming RPCs in elixir-grpc grpc_serverSame elixir-grpc/elixir-grpc/grpc package
  • Refused calls drain the HTTP/2 connection flow-control window in elixir-grpc grpc_serverSame elixir-grpc/elixir-grpc/grpc package
  • Path bindings ignored for gRPC Content-Types on transcoded routes in elixir-grpc grpc_serverSame elixir-grpc/elixir-grpc/grpc package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 13, 2026
References
5 linked sources
Open source record