yaklang
Yaklang is a domain-specific programming language built in Go for cybersecurity work, offering both compiled and interpreted execution through its own virtual machine (YakVM). It includes a full ecosystem of security libraries, CLI tools, and a GUI IDE called Yakit for vulnerability scanning, penetration testing, and security automation.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | yaklang/yaklang |
| Owner | yaklang |
| Primary language | Go |
| License | AGPL-3.0 — OSI-approved |
| Stars | 612 |
| Forks | 74 |
| Open issues | 30 |
| Latest release | 1.4.8-beta1 (2026-07-03) |
| Last updated | 2026-07-08 |
| Source | https://github.com/yaklang/yaklang |
What yaklang is
A strongly-typed, dynamically-capable DSL compiled to bytecode and executed by YakVM, with supporting infrastructure including SSA-based static analysis, SyntaxFlow pattern matching, LSP/DSP language server support, and a comprehensive security capability stack (network I/O, MITM, fuzzing, scanning, exploit payloads, traffic analysis). Written in Go, it targets macOS, Linux, and Windows.
Get the yaklang source
Clone the repository and explore it locally.
git clone https://github.com/yaklang/yaklang.gitcd yaklang# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Yaklang requires YakVM deployment for bytecode execution; ensure your infrastructure supports Go runtime and the VM binary distribution across target OS platforms.
- The AGPL-3.0 license triggers source-code disclosure obligations if you modify and network-deploy Yaklang; review your commercial/proprietary constraints and consider a license audit before embedding in closed products.
- Project maturity: 612 stars and ~3 years old (created April 2023) suggests active but niche adoption; validate that your team can learn the syntax and that sufficient community resources exist for your use case.
- Yakit IDE is the primary entry point for visual workflows; CLI/VSCode plugins exist for automation but are less mature; plan development workflow around Yakit or prepare to use lower-level CLI tooling.
- The architecture spans multiple compiler/VM components (CDSL, YakVM, SSA, SyntaxFlow, LSP/DSP); understand dependency trees and component versioning to avoid breaking integrations.
When to avoid it — and what to weigh
- Need general-purpose application development — Yaklang is domain-specific to cybersecurity; choosing it for non-security software introduces unnecessary abstraction layers and library mismatches.
- Require permissive (MIT/Apache) licensing — AGPL-3.0 requires source disclosure for modifications in networked/distributed deployments, which may conflict with proprietary product strategies; review your commercial use carefully.
- Prefer languages with larger ecosystem and team support — At 612 stars and 74 forks, Yaklang is significantly smaller than Go/Python/Node ecosystems; third-party libraries, Stack Overflow answers, and job-market adoption are more limited.
- Cannot accept early/beta release stability risk — Latest release is labeled 1.4.8-beta1 (dated 2026-07-03), indicating the project remains in active development; production deployments may encounter breaking changes.
License & commercial use
Licensed under AGPL-3.0 (GNU Affero General Public License v3.0). This is a copyleft license requiring that any modifications and networked deployments disclose source code. It is not a permissive OSI license suitable for closed-source or proprietary software without careful review.
AGPL-3.0 permits commercial use, but with significant strings: if you modify Yaklang and deploy it as a network service or integrate it into a product users interact with remotely, you must disclose the modified source. Using unmodified upstream Yaklang as a dependency in a closed-source tool is lower-risk but still requires legal review. Do not assume commercial freedom without a lawyer's assessment of your deployment model.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Adequate |
| License clarity | Needs review |
| Deployment complexity | Moderate |
| DEV.co fit | Good |
| Assessment confidence | Medium |
Yaklang is a security tool; standard considerations apply: (1) validate input to any DSL scripts, especially from untrusted sources, to prevent injection; (2) YakVM bytecode execution should be sandboxed if running adversarial scripts; (3) MITM and traffic interception features in Yakit require TLS/PKI management—ensure certificate handling is audited; (4) source code is open (AGPL-3.0) and auditable, but no security audit report is referenced; (5) third-party library dependencies (Go ecosystem) should be reviewed for known vulnerabilities.
Alternatives to consider
Metasploit Framework (Ruby) / Custom Go tools
Metasploit is mature and widely adopted; custom Go tools offer permissive licensing and larger ecosystems. Neither is DSL-centric, but both avoid AGPL constraints and are proven in production.
Nuclei (Go) by ProjectDiscovery
Nuclei is specifically designed for template-driven vulnerability scanning with YAML syntax, smaller footprint, permissive license (MIT), and strong community adoption. Yaklang is more general-purpose but less focused.
Python-based security frameworks (asyncio, Scapy, requests)
Python has vastly larger security tooling ecosystem, no copyleft license, and larger talent pool. Lacks Yaklang's integrated IDE/VM but offers more flexibility for custom security engineering.
Build on yaklang with DEV.co software developers
Review the AGPL-3.0 license terms with legal, prototype a pilot script in the Yakit IDE, and assess team learning curve. Contact us for guidance on integrating Yaklang into your security engineering stack.
Talk to DEV.coRelated open-source tools
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yaklang FAQ
Can I use Yaklang in a closed-source commercial product?
What is the difference between Yaklang and Yakit?
Is Yaklang production-ready?
Does Yaklang have a large community and third-party library ecosystem?
Software developers & web developers for hire
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Ready to evaluate Yaklang for your security workflow?
Review the AGPL-3.0 license terms with legal, prototype a pilot script in the Yakit IDE, and assess team learning curve. Contact us for guidance on integrating Yaklang into your security engineering stack.