# CodeQL 2.27.1 adds C and C++ query and Kotlin 2.4.20 support

By Steven Van · 2026-09-25

CodeQL 2.27.1 adds C/C++ and C# queries, Kotlin 2.4.20 support, and data flow model updates for Go, JS/TS, and Rust.

[GitHub](<https://creatorstoolbox.com/tools/github>)'s [CodeQL 2.27.1](<https://codeql.github.com/docs/codeql-overview/codeql-changelog/codeql-cli-2.27.1/>) adds new security queries and extends language support for the code scanning engine.

- New queries: **cpp/ambiguous-assignment-of-comparison** flags C/C++ expressions where a comparison result is assigned to a variable and used as a truth value, and **cs/linq/missed-firstordefault** flags C# foreach loops that could use LINQ's FirstOrDefault.

- CodeQL now supports Kotlin 2.4.20, and a fix to extraction under the Kotlin K2 compiler reduces false positives in queries such as java/android/implicit-pendingintents.

- C/C++ gets new taint flow models for boost::asio::ip::basic\_resolver::resolve, Bloomberg's BloombergLP::bdlbb::Blob, and the Protocol Buffers google::protobuf::MessageLite API.

- Go data flow models are added or improved for several Go 1.27 standard-library APIs, including bytes.CutLast, net/url.URL.Clone, and the new encoding/json/jsontext package.

- JavaScript/TypeScript: Fastify servers configured through chainable methods like withTypeProvider() are now recognised as the same server instance, improving route attribution for queries such as js/missing-rate-limiting.

- Rust: fixed path resolution for m::{self} paths, added data flow models for core::fmt::Write, and upgraded the Rust extractor to rust-analyzer 0.0.347.

![GitHub](<https://github.githubassets.com/assets/GitHub-Mark-ea2971cee799.png>)

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[Read the original announcement →](<https://codeql.github.com/docs/codeql-overview/codeql-changelog/codeql-cli-2.27.1/>)

[Read CodeQL 2.27.1 adds C and C++ query and Kotlin 2.4.20 support on Creators Toolbox](<https://creatorstoolbox.com/blog/github-codeql-2-27-1-adds-c-and-c-query-and-kotlin-2-4-20-support>)

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Canonical source: https://creatorstoolbox.com/blog/github-codeql-2-27-1-adds-c-and-c-query-and-kotlin-2-4-20-support