CVE-2025-69287: BSV Blockchain SDK has an Authentication Signature Data Preparation Vulnerability

February 17, 2026 (updated February 18, 2026)

A critical cryptographic vulnerability in the TypeScript SDK’s BRC-104 authentication implementation caused incorrect signature data preparation, resulting in signature incompatibility between SDK implementations and potential authentication bypass scenarios.

References

github.com/advisories/GHSA-vjpq-xx5g-qvmm
github.com/bsv-blockchain/ts-sdk
github.com/bsv-blockchain/ts-sdk/commit/d8cf6930028372079d977138ae9eaa03ae2f50bb
github.com/bsv-blockchain/ts-sdk/security/advisories/GHSA-vjpq-xx5g-qvmm
nvd.nist.gov/vuln/detail/CVE-2025-69287

Code Behaviors & Features

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