CVE-2026-40069Network attack vector

Transaction integrity loss via omitted ARC failure states

Published Apr 9, 2026 · Updated Apr 9, 2026

Improper exceptional-condition handling in BSV Ruby SDK 0.1.0 through 0.8.1 allows remote attackers to falsify broadcast success. The BSV::Network::ARC failure predicate accepts INVALID, MALFORMED, MINED_IN_STALE_BLOCK, and ORPHAN-bearing responses as successful broadcasts. Reachability requires an application to rely on that broadcaster result, allowing rejected transactions to trigger downstream integrity-sensitive actions.

CVSS severity7.5
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exceptional-condition handling in BSV Ruby SDK 0.1.0 through 0.8.1 allows remote attackers to falsify broadcast success. The BSV::Network::ARC failure predicate accepts INVALID, MALFORMED, MINED_IN_STALE_BLOCK, and ORPHAN-bearing responses as successful broadcasts. Reachability requires an application to rely on that broadcaster result, allowing rejected transactions to trigger downstream integrity-sensitive actions.

The record

CVE
CVE-2026-40069
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
BSV Blockchain
Product
BSV Ruby SDK
Classifications
CWE-754, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.1.0, < 0.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BSV Blockchain · BSV Ruby SDKversion=>= 0.1.0, < 0.8.2

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1565.002Transmitted Data Manipulation

Public exploit references

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Technologies

Your stack

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Your stack

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