elixir-grpc grpc_server up to 1.0.5 Cowboy handler.ex Elixir.GRPC.Server.Adapters.Cowboy.Handler.info allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in elixir-grpc grpc_server up to 1.0.5. Affected by this vulnerability is the function Elixir.GRPC.Server.Adapters.Cowboy.Handler.info of the file grpc_server/lib/grpc/server/adapters/cowboy/handler.ex of the component Cowboy. Such manipulation leads to allocation of resources. This vulnerability is documented as CVE-2026-71397. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in elixir-grpc grpc_server up to 1.0.5. Affected by this issue is the function Elixir.GRPC.Server.Adapters.Cowboy.Handler.info of the file grpc_server/lib/grpc/server/adapters/cowboy/handler.ex of the component Cowboy. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. Impacted is availability. CVE summarizes:

Allocation of Resources Without Limits or Throttling vulnerability in elixir-grpc grpc_server allows unauthenticated attackers to exhaust memory and crash the node via an oversized client-streaming or bidirectional-streaming request body. The streaming read clause of 'Elixir.GRPC.Server.Adapters.Cowboy.Handler':info/3 (grpc_server/lib/grpc/server/adapters/cowboy/handler.ex) never checks the configured max_body_size. Only the unary read path enforces that cap. 'Elixir.GRPC.Server.Adapters.Cowboy':reading_stream/1 (grpc_server/lib/grpc/server/adapters/cowboy.ex) appends every received chunk to its buffer until a complete length-prefixed message arrives. A client can declare a very large message and send it across many small HTTP/2 DATA frames, and the server buffers all of it. This issue affects grpc_server: from 1.0.0 before 1.0.6.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-71397 since 08/19/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 1.0.6 eliminates this vulnerability.

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Productinfo

Vendor

• elixir-grpc

Name

• grpc_server

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5

CPE 2.3info

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CPE 2.2info

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