{"id":"CVE-2023-26556","aliases":["EUVD-2023-1436","GHSA-3w84-4mjc-rjw7","GO-2023-1732"],"status":"published","title":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication","description":"io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00864,"percentile":0.59105,"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":["2.0.0","1.3.6-0.20230324145555-bb6fb30bd3eb"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/binance-chain/tss-lib","fixed_in":["2.0.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/bnb-chain/tss-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/binance-chain/tss-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/bnb-chain/tss-lib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.0.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/binance-chain/tss-lib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.0.0"}]}]},{"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-2023-26556","tags":["advisory"]},{"url":"https://medium.com/@iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b","tags":["web","advisory"]},{"url":"https://github.com/bnb-chain/tss-lib/issues/44","tags":["web"]},{"url":"https://github.com/bnb-chain/tss-lib/releases/tag/v2.0.0","tags":["web"]},{"url":"https://pkg.go.dev/vuln/GO-2023-1732","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3w84-4mjc-rjw7"},{"url":"https://github.com/bnb-chain/tss-lib","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-26556","description":"io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T00:00:00Z","modified":"2025-02-05T14:43:19.328Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:35:15.434947Z"}],"euvd":[{"id":"EUVD-2023-1436","description":"io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T00:00:00Z","modified":"2025-02-05T14:43:19Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-03T00:04:05.565654Z"}],"ghsa":[{"id":"GHSA-3w84-4mjc-rjw7","title":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication","description":"io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T18:30:24Z","modified":"2025-02-05T19:42:54Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:38:29.866763Z"}],"nvd":[{"id":"CVE-2023-26556","description":"io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T18:15:07.927Z","modified":"2026-06-17T05:43:35.32Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:07:56.683259Z"}],"osv":[{"id":"GHSA-3w84-4mjc-rjw7","title":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication","description":"io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)","status":"published","published":"2023-04-21T18:30:24Z","modified":"2025-02-05T20:26:58.387986Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T15:46:36.092962Z"},{"id":"GO-2023-1732","title":"Timing attack from non-constant time scalar multiplication in github.com/bnb-chain/tss-lib","description":"Timing attack from non-constant time scalar multiplication in github.com/bnb-chain/tss-lib.","status":"published","published":"2023-07-11T18:44:09Z","modified":"2025-02-05T20:26:58.387986Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}