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CriticalVulnerabilityCVE-2026-118375updated 28 Oct 2026, 03:22 UTC

llama.cpp RPC server can be crashed or hijacked by unauthenticated peers

Anyone who can reach the llama.cpp RPC server over the network can send oversized data that overwrites memory on the server. This can crash it, and in some cases could let an attacker run their own code.

Fix availableOfficial source
SeverityCriticalCVSS 9.2 of 10
Being exploited?UnclearNo reports either way yet
Fix available?Yesb11865 or later · since 28 Oct 2026
How sure is this?Official sourceBacked by an official source

How the attack works simplified

  1. 1Attacker connectsReaches the RPC server over the network
  2. 2Sends HELLO messageClaims RDMA capabilities
  3. 3Sends oversized dataUp to 256 KiB, no authentication needed
  4. 4Stack overflowsWrites past a 1-byte stack variable
  5. ResultServer crashes or attacker may run code

What happened

An out-of-bounds stack write in the ggml-rpc RDMA transport function rdma_recv() lets unauthenticated peers send up to 256 KiB into a 1-byte stack variable in rpc_serve_client() after advertising RDMA capability in the HELLO message.

Why it is dangerous: A successful attack can crash the server or potentially execute code on the machine running it. Anyone exposing the RPC server to a network, including over RDMA, is at risk.

Are you affected?

You are affected if you run llama.cpp builds from b8841 up to (but not including) b11865 with the ggml-rpc RDMA transport and an exposed rpc-server.

llama.cpp b8841 before b11865 (ggml-rpc RDMA transport, rpc-server)

What to do

  1. Update llama.cpp to b11865 or later
  2. If you cannot update now, disable the RDMA transport or the rpc-server
  3. Do not expose the rpc-server to untrusted networks, and restrict access with a firewall

Timeline

  1. 28 Oct 2026, 03:17 UTC
    Publicly disclosed
  2. 28 Oct 2026, 03:17 UTC
    Reported by NVD · NVD
  3. 28 Oct 2026, 03:22 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-118375
CVSS
9.2 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
28 Oct 2026, 03:17 UTC
On Zero Radar
28 Oct 2026, 03:22 UTC (5 min after disclosure)
Last change
28 Oct 2026, 03:22 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

llama.cpp RPC server can be crashed or hijacked by unauthenticated peers · Zero Radar