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HIGH severity

CVE-2023-26557 — tss-lib

HIGH

CVE-2023-26557 is a high-severity (CVSS 7.5) CWE-203 vulnerability in github.com/bnb-chain/tss-lib. A fix is available for github.com/bnb-chain/tss-lib — see the affected versions and patch details below.

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

Also known asGO-2023-1733
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-26557.

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs59th percentile — riskier than 59% of all scored CVEsHighest risk
0.00%0.45%0.91%1.36%0.3%0.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐹github.com/bnb-chain/tss-lib🐹github.com/binance-chain/tss-lib

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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.)

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/bnb-chain/tss-liball versions1.3.6-0.20230324145555-bb6fb30bd3ebgo get github.com/bnb-chain/tss-lib@v1.3.6-0.20230324145555-bb6fb30bd3eb
🐹Gogithub.com/binance-chain/tss-liball versions1.3.6-0.20230324145555-bb6fb30bd3ebgo get github.com/binance-chain/tss-lib@v1.3.6-0.20230324145555-bb6fb30bd3eb

Affected Products

1 product · 1 configurations
Application
tss-libiofinnet
< 2.0.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/bnb-chain/tss-lib, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/bnb-chain/tss-lib to 1.3.6-0.20230324145555-bb6fb30bd3eb or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-26557 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.)
O3 Security · Impact-Aware SCA

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CVE-2023-26557: tss-lib — Fix Available