Vulnerability · Published Oct 12, 2026 · Assigned by certcc
CVE-2026-84286OOB Read/Write via Negative Array Index in exllamav3_ext Kernel Table
Critical 9.8
In plain English
A critical-severity out-of-bounds read in ExLlamaV3 from Turboderp-org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Official description
ExLlamaV3’s EXL3 loader uses an untrusted, model-supplied index to select a CUDA kernel without first verifying that the index is within bounds. A malicious model can force the code to read and invoke an out‑of‑range function pointer, resulting in a reproducible crash. Under specific conditions involving certain host memory layouts, it may be possible for an attacker to exploit this vulnerability to achieve controlled indirect kernel dispatch during model load.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Turboderp-org | ExLlamaV3 | 3 |
Weakness: CWE-125, CWE-787, CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H