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securereview-coder-32B (FP8)

A security-focused fine-tune of Qwen2.5-Coder-32B-Instruct, quantized to FP8 for efficient, near-lossless inference. It performs function-level security code review, emitting structured JSON findings (category, CWE, severity, line, recommendation) for use in automated SAST pipelines.

This is the model that powers the Foil code-review engine. It is trained to read a function (plus light call-graph context and a short list of candidate security rules) and report real, exploitable vulnerabilities.

Base model & license. Derived from Qwen/Qwen2.5-Coder-32B-Instruct, licensed under Apache 2.0. This derivative is released under Apache 2.0; see NOTICE for attribution. No Qwen-restricted weights are included.

Intended use

  • Automated security code review / SAST as part of a scanner that supplies per-function context and a candidate rule set.
  • Languages: Python, JavaScript/TypeScript, Java, Go, Ruby, PHP, C#, and C/C++ (memory-safety classes).

Out of scope: standalone chat, non-security code tasks, dependency-CVE (SCA) analysis, and runtime/config issues that are not visible in source.

Vulnerability classes detected

Injection (SQL, command, code/eval), insecure deserialization (RCE), path traversal, SSRF, XXE, XSS, open redirect, broken access control, IDOR / broken object-level authorization (BOLA), broken authentication (incl. weak password-reset tokens), CSRF, sensitive-data exposure, and C/C++ memory-safety (buffer overflow, UAF, integer overflow).

Evaluation

Held-out test set (1,887 examples, served FP8 via vLLM):

Metric Value
Precision 41.0%
Recall 40.9%
F1 40.9%
False-positive rate (clean code) 0.7%
JSON-schema compliance 98.8%

The very low false-positive rate (0.7%) is the headline characteristic — the model is calibrated to stay quiet on clean code rather than over-flag, which is what makes it usable in an automated pipeline. Recall (~41%) is per-function single-pass; scanner-level recall is higher because functions are reviewed with call-graph context and candidate rules.

Per-language recall (test set): C# 65%, Rust 53%, Ruby 52%, JS 45%, Python 44%, Java 43%, TypeScript 42%, Go 40%, C++ 39%, C 32%.

Qualitative check with the Foil scanner against DVNA (OWASP Top-10 reference app): the model identified the documented data-flow and access-control vulns — SQL/command/code injection, XXE (RCE), insecure deserialization (RCE), broken access control, IDOR/BOLA (with ownership-fix reasoning), the A2 MD5-of-login reset-token logic flaw, and unvalidated redirect.

Known limitations. Reflected XSS whose sink lives in a separate view template (.ejs/.hbs unescaped output) can be missed when only the handler is in context — supply template context for full coverage. The model is thorough and may surface advisory findings (rate-limiting, headers) beyond a strict vuln set; triage accordingly. Dependency-CVE (A9), runtime misconfiguration (A6), and logging (A10) are out of scope for source-only review.

Serving (vLLM, OpenAI-compatible)

This is a compressed-tensors FP8 checkpoint (FP8_DYNAMIC) — vLLM auto-detects the quantization from the checkpoint, so no --quantization flag is needed:

vllm serve vitorallo/securereview-coder-32B-FP8 \
  --served-model-name securereview \
  --max-model-len 32768

The model emits a JSON object: {"findings": [{"severity", "category", "line", "code", "description", "recommendation", "confidence", "cwe_id"}]}. For best results with this fine-tune, do not force guided/constrained decoding — it was trained on a fixed JSON schema and grammar-constrained decoding can degrade output (over-flagging / missed classes).

Quantization recipe: FP8_DYNAMIC (per-channel static weight scales + per-token dynamic activation scales), lm_head kept in higher precision.

Citation / attribution

Built on Qwen2.5-Coder. Please cite the base model:

@article{hui2024qwen2coder, title={Qwen2.5-Coder Technical Report}, author={Qwen Team}, year={2024}}
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