{"cve":"CVE-2023-26556","nvd":{"published":"2023-04-21T18:15:07.927","modified":"2026-06-17T05:43:35.320","status":"Modified","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.)","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-203"],"references":["https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0","https://github.com/bnb-chain/tss-lib/tree/v1.3.5","https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3","https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b","https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0"],"products":["iofinnet:tss-lib"],"source":"nvd","synced_at":"2026-10-19T21:38:05.473481323+00:00"},"epss":{"cve":"CVE-2023-26556","score":0.00864,"percentile":0.58648,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-3w84-4mjc-rjw7","url":"https://osv.dev/vulnerability/GHSA-3w84-4mjc-rjw7","summary":"IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication","modified":"2025-02-05T20:26:58.387986Z","packages":[{"ecosystem":"Go","name":"github.com/bnb-chain/tss-lib","purl":"pkg:golang/github.com/bnb-chain/tss-lib","ranges":["<2.0.0"],"fixed":["2.0.0"]},{"ecosystem":"Go","name":"github.com/binance-chain/tss-lib","purl":"pkg:golang/github.com/binance-chain/tss-lib","ranges":["<2.0.0"],"fixed":["2.0.0"]}]},{"id":"GO-2023-1732","url":"https://osv.dev/vulnerability/GO-2023-1732","summary":"Timing attack from non-constant time scalar multiplication in github.com/bnb-chain/tss-lib","modified":"2025-02-05T20:26:58.387986Z","packages":[{"ecosystem":"Go","name":"github.com/bnb-chain/tss-lib","purl":"pkg:golang/github.com/bnb-chain/tss-lib","ranges":["<1.3.6-0.20230324145555-bb6fb30bd3eb"],"fixed":["1.3.6-0.20230324145555-bb6fb30bd3eb"]},{"ecosystem":"Go","name":"github.com/binance-chain/tss-lib","purl":"pkg:golang/github.com/binance-chain/tss-lib","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}