Weakness Type (CWE)

CWE-770 — CWE-770 Allocation of Resources Without Limits or Throttling

CAPEC

CVSS 4.0 Score

8.7

HIGH

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

Vulnerability description

Allocation of Resources Without Limits or Throttling vulnerability in elixir-grpc grpc allows unauthenticated attackers to exhaust the BEAM's memory and crash the server by streaming a large or slow-trickle unary request body.

'Elixir.GRPC.Server.Adapters.Cowboy.Handler':read_full_body/3 (lib/grpc/server/adapters/cowboy/handler.ex) accumulates every received chunk into a single growing binary with no size cap. Additionally, when the client omits the grpc-timeout header, the per-chunk read timeout resolves to :infinity, allowing a slow-trickle client to keep the connection alive indefinitely while memory grows. A single connection is sufficient to exhaust server memory and crash the node.

This issue affects grpc from 0.3.1 before 1.0.0.

Affected

pkg:hex/grpc

Module Source File Routine
GRPC.Server.Adapters.Cowboy.Handler lib/grpc/server/adapters/cowboy/handler.ex GRPC.Server.Adapters.Cowboy.Handler.read_full_body/3
Status Type Version Changes / Fixed in
affected semver ⓘ 0.3.1 < 1.0.0

pkg:github/elixir-grpc/grpc

Module Source File Routine
GRPC.Server.Adapters.Cowboy.Handler lib/grpc/server/adapters/cowboy/handler.ex GRPC.Server.Adapters.Cowboy.Handler.read_full_body/3
Status Type Version Changes / Fixed in
affected git ⓘ d1abe70a6c < 49e18c3ec6

References

Credits

  • Finder: Peter Ullrich
  • Remediation developer: Paulo Valente
  • Analyst: Jonatan Männchen

CVE record as JSON:  GET /cves/CVE-2026-48854.json
OSV record as JSON:  GET /osv/EEF-CVE-2026-48854.json