What is taint analysis?

Taint analysis is the main difference between a data-flow SAST engine and a pattern matcher. It follows a value across assignments, function calls and files, asking whether attacker-controlled data can reach a dangerous operation without being sanitized along the way.

The payoff is precision: a hardcoded string passed to a SQL query is not a vulnerability, and taint analysis knows the difference. It costs build time and needs per-framework modeling to know which functions count as sources and sinks, which is why fast pattern-based rules still have a place for simple checks and team conventions.

What to look for

Whether analysis crosses file and function boundaries, or stops at one function
Framework coverage for your stack, since modeling is per-framework work
Whether the tool shows the full source-to-sink path in the finding
Scan-time impact on large repositories

Best 10 code quality, security and code review tools with taint analysis

Every tool in the directory whose documentation covers this, 8 fully and 2 partially. Full support is shown first. Shown in a random order that changes on every visit, so no tool gets an advantage from its position.

Support is not the same as parity, since some implementations are narrower in scope, gated to a higher plan tier, or maintained only for existing customers. The note under each tool is what its own documentation describes.

Code Security Platform

Aikido

Data flow analysis inside AI Deep Review; credit-metered, Pro plan and above

Code Security Platform

Checkmarx One

Attack Vector shows source-to-sink tainted data flow; Best Fix Location is chosen within that data-flow graph.

PR Review Tool

CodeRabbit

AI Deep Scan traces untrusted input to sensitive sinks with call stacks; separately billed

Code Security Platform

Corgea

Cross-file source-to-sink taint tab in BLAST Full View

Code Security Platform

GitHub Advanced Security

CodeQL taint tracking; model packs add taint-flow models and threat models add taint sources, both public preview

Code Security Platform

Semgrep

Taint tracking with constant/symbolic propagation; cross-file interfile taint requires Pro Engine and full scans only.

Code Security Platform

Snyk

Source-to-sink data flow analysis with AI-learned sources, sinks and sanitizers; data-flow visualization.

Code Quality Platform

SonarQube

Tracks data flow from untrusted sources to dangerous sinks; Advanced SAST sold separately.

AI Coding Agent

ChatGPT / Codex

Cloud finding pages show call-path and data-flow context 'when available'; no taint engine.

AI Coding Agent

Claude Code

Managed Claude Security "traces data flows across files" per vendor docs; beta, Enterprise plan only.

SAST Secrets Detection Secrets Validation SCA Reachability Analysis Malicious Package Detection

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