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

Summaryinfo

A vulnerability marked as problematic has been reported in elixir-grpc grpc_server up to 1.0.5. Impacted is the function GRPC.Server.Adapters.Cowboy.Handler.info of the file grpc_server/lib/grpc/server/adapters/cowboy/handler.ex of the component Streaming Read. The manipulation leads to allocation of resources. This vulnerability is traded as CVE-2026-124279. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in elixir-grpc grpc_server up to 1.0.5 and classified as problematic. This issue affects the function GRPC.Server.Adapters.Cowboy.Handler.info of the file grpc_server/lib/grpc/server/adapters/cowboy/handler.ex of the component Streaming Read. 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. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-124279 since 11/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

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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