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syn — deep security report

ShadowCanopy's full breakdown of syn on crates.io: verdict, AI analysis, dependency chain, network behavior, prebuilds, and obfuscated code.

Safe to use
Deep-scanned by ShadowCanopy — no threats found in its code, dependencies, or network behavior.
Scanned 8/11/2026
Approvedsyn@3.0.3View on registry ↗latest: 3.0.3

False positive from ATK-028. The match on 'F::' is Rust generic associated-type syntax inside a parser helper (parse_scoped<F: Parser> ... -> Result<F::Output>). No network code, IPs, or exfiltration exists. This is the legitimate 'syn' crate.

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AI breakdown

Plain-English summary of what this package does and how it behaves.

syn is a Rust crate providing a parser for Rust source code into syntax trees, with supporting modules for attributes, expressions, and derives.

Capabilities

  • Parses Rust tokens into syntax trees
  • Supports custom keywords and punctuation
  • Includes generated trait implementations (Clone, Debug, Eq, Hash, Fold)

Data access

  • None observed

Network

  • Hardcoded public IP in network code

A widely-used pure parsing library with no dependencies or scripts. Static findings flag potential hardcoded IPs, which should be verified against the actual source before adoption.

Security findings (2)

Static analysis rule matches, with the exact code that triggered them.

highHardcoded public IP in network codeATK-028src/parse.rs

File src/parse.rs contains a hardcoded public IP (F::) used in network code — review for hidden exfiltration or C2 endpoints.

highHardcoded public IP in network codeATK-028syn-3.0.3/src/parse.rs

File syn-3.0.3/src/parse.rs contains a hardcoded public IP (F::) used in network code — review for hidden exfiltration or C2 endpoints.

Files in package (208)

.cargo_vcs_info.jsonsyn-3.0.3/.cargo_vcs_info.jsonCargo.locksyn-3.0.3/Cargo.lockCargo.tomlsyn-3.0.3/Cargo.tomlCargo.toml.origsyn-3.0.3/Cargo.toml.origLICENSE-APACHEsyn-3.0.3/LICENSE-APACHELICENSE-MITsyn-3.0.3/LICENSE-MITREADME.mdsyn-3.0.3/README.mdbenches/file.rssyn-3.0.3/benches/file.rsbenches/rust.rssyn-3.0.3/benches/rust.rssrc/attr.rssyn-3.0.3/src/attr.rssrc/bigint.rssyn-3.0.3/src/bigint.rssrc/buffer.rssyn-3.0.3/src/buffer.rssrc/classify.rssyn-3.0.3/src/classify.rssrc/custom_keyword.rssyn-3.0.3/src/custom_keyword.rssrc/custom_punctuation.rssyn-3.0.3/src/custom_punctuation.rssrc/data.rssyn-3.0.3/src/data.rssrc/derive.rssyn-3.0.3/src/derive.rssrc/discouraged.rssyn-3.0.3/src/discouraged.rssrc/drops.rssyn-3.0.3/src/drops.rssrc/error.rssyn-3.0.3/src/error.rs

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This report reflects ShadowCanopy's threat intelligence at page load and is informational, not a warranty. Canonical URL: https://shadowcanopy.dev/packages/crates/syn