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CVE-2023-26557

23
FAUCET Score

CVE-2023-26557 is a timing side-channel vulnerability in io.finnet tss-lib versions prior to 2.0.0, also affecting bnb-chain/tss-lib and thorchain/tss, that can leak the lambda value of a private key due to non-constant time operations in Go's big.Int. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and high confidentiality impact, but no integrity or availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.0CPE matchmatch criteria
cpe:2.3:a:iofinnet:tss-lib:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.86%
Probability of exploitation in next 30 days
EPSS Percentile
54.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 30th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

gopatch availablevia ghsa
Product: github.com/bnb-chain/tss-libFixed in: 1.3.6-0.20230324145555-bb6fb30bd3eb
gopatch availablevia ghsa
Product: github.com/binance-chain/tss-libFixed in: 1.3.6-0.20230324145555-bb6fb30bd3eb

Vendor Advisories (1)

goGHSA-mjqv-xhgm-gx8chigh

IO FinNet tss-lib vulnerable to timing attack from non-constant time scalar arithmetic

Apr 21, 2023

References

github.com / bnb-chain/tss-lib/tree/v1.3.5
Product
github.com / IoFinnet/tss-lib/releases/tag/v2.0.0
Release Notes
gitlab.com / thorchain/tss/tss-lib/-/tags/v0.1.3
Release Notes
medium.com / %40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b