7.5

CVE-2023-26557: iofinnet tss-lib Observable Discrepancy

Modified
AliasesGHSA-mjqv-xhgm-gx8cGO-2023-1733
Published 21-04-2023Last modified 05-02-2025

Vulnerability summary

CVE-2023-26557 is a high (CVSS 7.5) Observable Discrepancy vulnerability in iofinnet tss-lib. EPSS estimates a 0.86% chance of exploitation in the next 30 days, higher than 58.6% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.86%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 21-04-2023
    PublishedVulnerability first disclosed.
  2. 05-02-2025
    Last modifiedVulnerability information updated.

Description

io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.86%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.86% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/binance-chain1 product
  • tss-lib< 1.3.6-0.20230324145555-bb6fb30bd3eb | All versions (No fix recorded)
Github.com/bnb-chain1 product
  • tss-lib< 1.3.6-0.20230324145555-bb6fb30bd3eb
Iofinnet1 product

3 vendors · 3 products

References

8 links