{"id":"CVE-2023-26557","aliases":["EUVD-2023-1438","GHSA-mjqv-xhgm-gx8c","GO-2023-1733"],"status":"published","title":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar arithmetic","description":"io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00864,"percentile":0.59056,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-203"],"published":"2023-04-21T00:00:00Z","modified":"2026-06-17T05:43:35Z","fixes":[{"ecosystem":"Go","package":"github.com/bnb-chain/tss-lib","fixed_in":["1.3.6-0.20230324145555-bb6fb30bd3eb"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/binance-chain/tss-lib","fixed_in":["1.3.6-0.20230324145555-bb6fb30bd3eb"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/bnb-chain/tss-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.6-0.20230324145555-bb6fb30bd3eb"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/binance-chain/tss-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.6-0.20230324145555-bb6fb30bd3eb"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/bnb-chain/tss-lib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.3.6-0.20230324145555-bb6fb30bd3eb"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/binance-chain/tss-lib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.3.6-0.20230324145555-bb6fb30bd3eb"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/bnb-chain/tss-lib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.3.6-0.20230324145555-bb6fb30bd3eb"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/binance-chain/tss-lib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]}],"products":[{"vendor":"iofinnet","product":"tss-lib"}],"references":[{"url":"https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0","tags":["x_transferred","Release Notes","web"]},{"url":"https://github.com/bnb-chain/tss-lib/tree/v1.3.5","tags":["x_transferred","Product","web"]},{"url":"https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3","tags":["x_transferred","Release Notes","web"]},{"url":"https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b","tags":["x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-26557","tags":["advisory"]},{"url":"https://medium.com/@iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b","tags":["web","advisory"]},{"url":"https://pkg.go.dev/vuln/GO-2023-1733","tags":["web"]},{"url":"https://github.com/advisories/GHSA-mjqv-xhgm-gx8c"},{"url":"https://github.com/bnb-chain/tss-lib","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-26557","description":"io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T00:00:00Z","modified":"2025-02-05T14:35:44.807Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:35:15.434947Z"}],"euvd":[{"id":"EUVD-2023-1438","description":"io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T00:00:00Z","modified":"2025-02-05T14:35:44Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-03T00:04:05.565654Z"}],"ghsa":[{"id":"GHSA-mjqv-xhgm-gx8c","title":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar arithmetic","description":"io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T18:30:24Z","modified":"2025-02-05T19:43:34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:38:29.866763Z"}],"nvd":[{"id":"CVE-2023-26557","description":"io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T18:15:07.99Z","modified":"2026-06-17T05:43:35.553Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:07:56.683259Z"}],"osv":[{"id":"GHSA-mjqv-xhgm-gx8c","title":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar arithmetic","description":"io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T18:30:24Z","modified":"2025-02-05T20:42:12.163107Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T15:46:51.811331Z"},{"id":"GO-2023-1733","title":"Timing attack from non-constant time scalar arithmetic in github.com/bnb-chain/tss-lib","description":"Timing attack from non-constant time scalar arithmetic in github.com/bnb-chain/tss-lib.","status":"published","published":"2023-07-11T18:44:28Z","modified":"2025-02-05T20:42:12.163107Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}