Improper Verification of Cryptographic Signature Affecting bsv-sdk package, versions <0.8.2
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-RUBY-BSVSDK-16068884
- published15 Apr 2026
- disclosed9 Apr 2026
- creditSimon Bettison
Introduced: 9 Apr 2026
NewCVE-2026-40070 (opens in a new tab)How to fix?
Upgrade bsv-sdk to version 0.8.2 or higher.
Overview
bsv-sdk is an A Ruby library for interacting with the BSV Blockchain — keys, scripts, transactions, and more.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the acquire_certificate function. An attacker can persist forged certificate records by supplying arbitrary signatures or by controlling a certifier endpoint, causing downstream processes to treat these forged certificates as authentic. This can lead to unauthorized assertion of identity attributes and pollution of the credential store with attacker-controlled data.
Workaround
This vulnerability can be mitigated by restricting access to acquire_certificate to trusted callers only, avoiding the use of untrusted certifier URLs with the issuance protocol, enforcing TLS for such requests, and performing out-of-band verification of certificates before relying on their contents.