CVE-2026-39909
llama.cpp Use-After-Free in RPC GRAPH_RECOMPUTE Handler
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
llama.cpp before b8585 contains a use-after-free vulnerability in the RPC server's GRAPH_RECOMPUTE handler that allows unauthenticated remote attackers to achieve arbitrary read and write access by storing a computation graph, freeing referenced buffers, and reclaiming freed memory with attacker-controlled content. Attackers can send RPC requests to trigger re-execution of stored graphs with dangling pointers, enabling full remote code execution without requiring authentication or user interaction.
| CWE | CWE-416 |
| Vendor | ggml-org |
| Product | llama.cpp |
| Published | Aug 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
ggml-org / llama.cpp
0 < b8585
References
github.com: https://github.com/ggml-org/llama.cpp/releases/tag/b8585 github.com: https://github.com/ggml-org/llama.cpp/pull/21175 github.com: https://github.com/ggml-org/llama.cpp/commit/389c7d4955ba55c7418afaebf7c23d9ed64ef707 vulncheck.com: https://www.vulncheck.com/advisories/llama-cpp-use-after-free-in-rpc-graph-recompute-handler
Credits
Olivier Laflamme