llama.cpp — Deserialization (CVE-2026-34159)
Date: 2026-04
Affected: ggml/llama.cpp
Attack vector: deserialization
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2026-34159
CWE: CWE-119
CVSS: 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's deserialize_tensor() skips all bounds validation when a tensor's buffer field is 0. An unauthenticated attacker can read and write arbitrary process memory via crafted GRAPH_COMPUTE messages. Combined with pointer leaks from ALLOC_BUFFER/BUFFER_GET_BASE, this gives full ASLR bypass and remote code execution. No authentication required, just TCP access to the RPC server port. This issue has been patched in version b8492.


Mitigations:

Architectural layers (MAESTRO):