CVE-2023-26556
IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication
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.)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.)
- Record
CVE-2023-26556- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
CVE List
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.)
- Record
CVE-2023-26556- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
EUVDEUVD-2023-1436
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.)
- Record
EUVD-2023-1436- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3w84-4mjc-rjw7
IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication
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.)
- Record
GHSA-3w84-4mjc-rjw7- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
OSVGHSA-3w84-4mjc-rjw7
IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar multiplication
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.)
- Record
GHSA-3w84-4mjc-rjw7- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
OSVGO-2023-1732 No score
Timing attack from non-constant time scalar multiplication in github.com/bnb-chain/tss-lib
Timing attack from non-constant time scalar multiplication in github.com/bnb-chain/tss-lib.
- Record
GO-2023-1732- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/bnb-chain/tss-libGo |
before 2.0.0 | 2.0.0 |
github.com/binance-chain/tss-libGo |
before 2.0.0 | 2.0.0 |
github.com/bnb-chain/tss-libGo |
before 1.3.6-0.20230324145555-bb6fb30bd3eb | 1.3.6-0.20230324145555-bb6fb30bd3eb |
github.com/binance-chain/tss-libGo |
All versions | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-26556 is a critical vulnerability (CVSS 9.1) in Iofinnet Tss-lib, published April 21, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.86%, the 58th percentile. Fixed in github.com/bnb-chain/tss-lib 2.0.0.
References
github.com/IoFinnet/tss-lib/releases/tag/v2.0.0
gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3
medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
nvd.nist.gov/vuln/detail/CVE-2023-26556