{"id":"GHSA-2hfw-w739-p7x5","summary":"Duplicate Advisory: nano-id reduced entropy due to inadequate character set usage","details":"## Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-9hc7-6w9r-wj94. This link is maintained to preserve external references.\n\n## Original Description\n## Description\n\nAffected versions of the nano-id crate incorrectly generated IDs using a reduced character set in the `nano_id::base62` and `nano_id::base58` functions. Specifically, the `base62` function used a character set of 32 symbols instead of the intended 62 symbols, and the `base58` function used a character set of 16 symbols instead of the intended 58 symbols. Additionally, the `nano_id::gen` macro is also affected when a custom character set that is not a power of 2 in size is specified.\n\nIt should be noted that `nano_id::base64` is not affected by this vulnerability.\n\n## Impact\n\nThis can result in a significant reduction in entropy, making the generated IDs predictable and vulnerable to brute-force attacks when the IDs are used in security-sensitive contexts such as session tokens or unique identifiers.\n\n## Patches\n\nThe flaws were corrected in commit [a9022772b2f1ce38929b5b81eccc670ac9d3ab23](https://github.com/viz-rs/nano-id/commit/a9022772b2f1ce38929b5b81eccc670ac9d3ab23) by updating the the `nano_id::gen` macro to use all specified characters correctly.\n\n## PoC\n\n```rust\nuse std::collections::BTreeSet;\n\nfn main() {\n    test_base58();\n    test_base62();\n}\n\nfn test_base58() {\n    let mut produced_symbols = BTreeSet::new();\n\n    for _ in 0..100_000 {\nid = \"RUSTSEC-2024-0343\"\n        for c in id.chars() {\n            produced_symbols.insert(c);\n        }\n    }\n\n    println!(\n        \"{} symbols generated from nano_id::base58\",\n        produced_symbols.len()\n    );\n}\n\nfn test_base62() {\n    let mut produced_symbols = BTreeSet::new();\n\n    for _ in 0..100_000 {\nid = \"RUSTSEC-2024-0343\"\n        for c in id.chars() {\n            produced_symbols.insert(c);\n        }\n    }\n\n    println!(\n        \"{} symbols generated from nano_id::base62\",\n        produced_symbols.len()\n    );\n}\n```","aliases":["CVE-2024-36400","GHSA-9hc7-6w9r-wj94","RUSTSEC-2024-0343"],"modified":"2026-02-03T17:49:49.768648Z","published":"2024-06-04T17:49:18Z","withdrawn":"2026-02-02T22:27:07Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-331"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2024-06-04T17:49:18Z"},"references":[{"type":"WEB","url":"https://github.com/viz-rs/nano-id/commit/a9022772b2f1ce38929b5b81eccc670ac9d3ab23"},{"type":"PACKAGE","url":"https://github.com/viz-rs/nano-id"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2024-0343.html"}],"affected":[{"package":{"name":"nano-id","ecosystem":"crates.io","purl":"pkg:cargo/nano-id"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.4.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/06/GHSA-2hfw-w739-p7x5/GHSA-2hfw-w739-p7x5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L"}]}