io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack…
Priority MEDIUM 49CWE-203Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-203.
Summary
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.)
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00864 58th percentileScored 2026-11-07
Fix Fixed github.com/bnb-chain/tss-lib (Go): 2.0.0github.com/binance-chain/tss-lib (Go): 2.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/bnb-chain/tss-lib (Go) | before 2.0.0 | 2.0.0 | Patch available | GHSA-3w84-4mjc-rjw7 |
| — | github.com/binance-chain/tss-lib (Go) | before 2.0.0 | 2.0.0 | Patch available | GHSA-3w84-4mjc-rjw7 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/bnb-chain/tss-lib (Go) Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available GHSA-3w84-4mjc-rjw7
- github.com/binance-chain/tss-lib (Go) Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available GHSA-3w84-4mjc-rjw7
Remediation
- Fix · GHSA-3w84-4mjc-rjw7 github.com/bnb-chain/tss-lib (Go) Fixed in 2.0.0 Advisory →
- Fix · GHSA-3w84-4mjc-rjw7 github.com/binance-chain/tss-lib (Go) Fixed in 2.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-26556
- 2026-10-03 Alias added: GHSA-3w84-4mjc-rjw7
References
Other 9
- 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/bnb-chain/tss-lib/issues/44
- https://github.com/bnb-chain/tss-lib
- https://github.com/bnb-chain/tss-lib/releases/tag/v2.0.0
- https://medium.com/@iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
- https://pkg.go.dev/vuln/GO-2023-1732
More Iofinnet Tss-lib vulnerabilities
- TI-2022-23745 IO FinNet tss-lib before 2.0.0 allows a collision of hash values. CVSS 3.1CRITICAL 9.1
- TI-2023-11694 io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing… CVSS 3.1HIGH 7.5
- TI-2022-23744 An issue was discovered in IO FinNet tss-lib before 2.0.0. CVSS 3.1MEDIUM 6.8
Sources
- CVE-2023-26556 · CVE Program
- CVE-2023-26556 · NVD
- FIRST EPSS
- GHSA-3w84-4mjc-rjw7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences