Bug 2489071 (CVE-2026-48853)

Summary: CVE-2026-48853 grpc: elixir-grpc grpc: Remote Code Execution and Denial of Service via Deserialization of Untrusted Data
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: urgent Docs Contact:
Priority: urgent    
Version: unspecifiedCC: eshamard, jvasik, kaycoth, rblanco
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the grpc component of elixir-grpc. This vulnerability allows unauthenticated attackers to send specially crafted messages, leading to two critical outcomes. First, it can cause a Denial of Service (DoS) by crashing the Erlang virtual machine (BEAM node). Second, under certain conditions, it enables remote code execution, allowing attackers to run their own programs on the affected server.
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Description OSIDB Bzimport 2026-06-15 23:01:25 UTC 
Deserialization of Untrusted Data and Allocation of Resources Without Limits or Throttling vulnerabilities in elixir-grpc grpc allow unauthenticated attackers to crash the BEAM node via atom table exhaustion and, when a decoded term flows into a call site that invokes it, achieve remote code execution on the server.

'Elixir.GRPC.Codec.Erlpack':decode/2 (lib/grpc/codec/erlpack.ex) calls :erlang.binary_to_term/1 on the raw gRPC message body without the :safe option, no size bound, and no type guard. Any unauthenticated peer that sends a request with Content-Type: application/grpc+erlpack can send a crafted payload that mints arbitrary new atoms (which are never garbage-collected, exhausting the bounded atom table and crashing the VM) or that encodes a fun term which, if applied anywhere downstream, executes attacker-controlled code inside the server process.

This issue affects grpc from 0.4.0 before 1.0.0.