Improper Following of Specification by Caller Affecting @bsv/sdk package, versions <2.0.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-BSVSDK-15307716
- published18 Feb 2026
- disclosed17 Feb 2026
- creditF1r3Hydr4nt
Introduced: 17 Feb 2026
NewCVE-2025-69287 (opens in a new tab)How to fix?
Upgrade @bsv/sdk to version 2.0.0 or higher.
Overview
@bsv/sdk is a BSV Blockchain Software Development Kit
Affected versions of this package are vulnerable to Improper Following of Specification by Caller in the Peer class, used by the processInitialRequest and processInitialResponse methods. An attacker can cause a signature to be insufficiently validated, which may lead to incompatibility with other SDK implementations using mutual BRC-104 authentication. When the affected methods prepare signatures, they concatenate nonce strings before encoding, thus losing entropy, compared to the protocol specification and to other implementations.