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Malicious code in tx-guard-snap (npm)

0
Critical
Published: 07/07/2026 (07/07/2026, 15:29:37 UTC)
Source: GCVE Database
Product: tx-guard-snap

Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (fce7ebfc771355b732949df26e92e2ec8a80c0de7cda46bcb865687c33d572ff) tx-guard-snap advertises itself as a real-time transaction security analysis MetaMask Snap but performs no analysis. Its onTransaction handler unconditionally POSTs the user's transaction fields (from, to, value, data, chainId, timestamp) to a hardcoded endpoint (http://localhost:8888/tx in the shipped build, labeled 'C2_URL' in source), exfiltrating every signed transaction's parameters to an author-controlled destination. In parallel, the Snap always returns a critical-severity 'Security Warning' panel claiming the destination address 'has been flagged in 3 threat databases', regardless of the actual destination — the source comment describes this as a 'fake security warning to victim'. The combination — deceptive security-tool cover story, unconditional transaction-data exfiltration to a hardcoded endpoint, and fabricated warning UI intended to desensitize users or steer them away from legitimate transactions — is a malicious Snap template. The loopback URL in this specific build is trivially swapped to a remote host by republishing. ## Source: ghsa-malware (aa637cf60fc7dbe1dde1abcc33e254a7fff316f7f8edd922fdf948bd8d99b06f) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Affected software

npmghsa
tx-guard-snap

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 07/08/2026, 13:54:39 UTC

Technical Analysis

The 'tx-guard-snap' package in the npm ecosystem is identified as malicious. Installation or execution of this package results in a full compromise of the host system, potentially granting an attacker complete control. Due to the nature of the compromise, simply uninstalling the package may not remove all malicious artifacts or backdoors. The advisory recommends treating any affected system as fully compromised and rotating all secrets and keys from a separate, secure environment.

Potential Impact

Full system compromise on any computer with the package installed or running. Potential unauthorized access to all stored secrets and keys. Persistence of malicious code beyond package removal is likely, increasing risk of ongoing unauthorized control.

Mitigation Recommendations

Remove the 'tx-guard-snap' package immediately. Rotate all secrets and keys stored on the affected system from a different, secure computer. Because full system compromise is possible, consider rebuilding or thoroughly cleaning the affected system to ensure removal of all malicious components. No official patch or fix is available as this is a malicious package rather than a vulnerability in legitimate software.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
MAL-2026-6943
Osv Schema Version
1.7.4
Aliases
["GHSA-8w4p-m2h2-2wj5"]
Ecosystems
["npm"]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a4e4f16c9d9e3dbe328e796

Added to database: 07/08/2026, 13:22:30 UTC

Last enriched: 07/08/2026, 13:54:39 UTC

Last updated: 07/29/2026, 04:32:05 UTC

Views: 42

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