Overview
The WOWS Replays Unpacker is a specialized .NET library designed to parse and extract data from World of Warships replay files. Built for precision and performance, it enables developers to leverage replay data for analytics, player insights, and third-party tooling across the community.
Since its creation, the library has become a cornerstone dependency for major .NET-based World of Warships community projects, powering tools such as WOWS Karma, WOWS Monitor, and many others.
Key Features
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Replay Parsing Engine
Reads and interprets complex World of Warships replay files with high fidelity.
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Structured Data Extraction
Converts raw replay streams into accessible game metadata, player actions, and battle outcomes.
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Lightweight & Performant
Optimized .NET code ensures quick turnaround for batch processing of replays.
Security Contribution
In 2022, our team’s deep work with replay parsing led to the discovery of CVE-2022-31265, a critical security vulnerability in Wargaming’s replay handling.
- Discovery & Disclosure: Identified and responsibly reported by our team.
- Fix & Collaboration: Coordinated with Wargaming to ensure prompt patching.
- Impact: Prevented potential exploitation of malformed replay files and reinforced the safety of replay-driven community tools.
While the vulnerability, Python-based, did not affect our library directly, our expertise in replay file structures and parsing was instrumental in uncovering the issue. As for this achievement, it underscores the technical expertise and security awareness at the core of our work, and demonstrates the importance of open-source community contributions in safeguarding gaming ecosystems.
Impact & Adoption
WOWS Replays Unpacker plays a quiet but vital role in the World of Warships ecosystem. By making replay data accessible, it enables both developers and players to build better analytical tools, strategize, and enjoy deeper insights into their battles.
By the Numbers
- A dozen of community tools daily powered, including WOWS Karma and WOWS Monitor.
- 40 000+ downloads across the .NET ecosystem.
- CVE-2022-31265 discovered & fixed thanks to replay parsing expertise.
Open Source & Community
The library is fully open-source, a critical factor in its widespread adoption and trust within the community. With the previous security threat having sent ripples through the ecosystem, transparency and community involvement have never been more important.
About NSYS
Day to day, we combine technical excellence with a commitment to community impact. WOWS Replays Unpacker exemplifies this approach: a project that not only fuels some of the most popular tools in the World of Warships ecosystem, but also demonstrates our capacity to contribute to global security standards through vulnerability research and responsible disclosure.
This balance between engineering rigor and community collaboration is at the heart of our OSS mission : building tools that empower ecosystems, strengthen resilience, and advance innovation.