{"id":"CVE-2023-26556","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-26556","generatedAt":"2026-10-24T13:57:51.802Z","title":"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).","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.)","published":"2023-04-21T18:15:08.000Z","lastModified":"2026-06-17T05:43:35.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-203"],"affected":["iofinnet/tss-lib"],"epss":{"score":0.00864,"percentile":0.58251,"date":"2026-10-23","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.86%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://github.com/bnb-chain/tss-lib/tree/v1.3.5","tags":["Product"],"source":"cve@mitre.org"},{"url":"https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b","source":"cve@mitre.org"},{"url":"https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/bnb-chain/tss-lib/tree/v1.3.5","tags":["Product"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-26556","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}