GHSA-FPVP-JGX3-4W9Q
Vulnerability from github – Published: 2026-08-21 18:34 – Updated: 2026-08-21 18:34llama.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.
{
"affected": [],
"aliases": [
"CVE-2026-39909"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-21T17:16:30Z",
"severity": "CRITICAL"
},
"details": "llama.cpp before b8585 contains a use-after-free vulnerability in the RPC server\u0027s 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.",
"id": "GHSA-fpvp-jgx3-4w9q",
"modified": "2026-08-21T18:34:58Z",
"published": "2026-08-21T18:34:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39909"
},
{
"type": "WEB",
"url": "https://github.com/ggml-org/llama.cpp/pull/21175"
},
{
"type": "WEB",
"url": "https://github.com/ggml-org/llama.cpp/commit/389c7d4955ba55c7418afaebf7c23d9ed64ef707"
},
{
"type": "WEB",
"url": "https://github.com/ggml-org/llama.cpp/releases/tag/b8585"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/llama-cpp-use-after-free-in-rpc-graph-recompute-handler"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
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