CVE-2025-59331Known exploitationNetwork attack vector

Cryptocurrency theft via browser API interception

Published Sep 15, 2025 · Updated Sep 15, 2025

Embedded malicious code in is-arrayish 0.3.3 allows remote attackers to redirect cryptocurrency transactions in browser applications. Obfuscated code added to index.js hooks fetch, XMLHttpRequest, and wallet-provider APIs, then replaces payment destinations and approval targets with attacker-controlled addresses. Execution requires the compromised release to be bundled into a browser application; local, server, and command-line use is not affected.

CVSS severity8.2
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Embedded malicious code in is-arrayish 0.3.3 allows remote attackers to redirect cryptocurrency transactions in browser applications. Obfuscated code added to index.js hooks fetch, XMLHttpRequest, and wallet-provider APIs, then replaces payment destinations and approval targets with attacker-controlled addresses. Execution requires the compromised release to be bundled into a browser application; local, server, and command-line use is not affected.

The record

CVE
CVE-2025-59331
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
Qix-
Product
is-arrayish
Classifications
CWE-506, T1195.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2025Exploitation reportedQix npm package compromise campaign
  2. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  3. Sep 15, 2025Record 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== 0.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qix- · is-arrayishversion== 0.3.3

Published CVSS scores

8.8GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:A/U:Red
8.2GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-506Embedded Malicious Code
T1195.002Compromise Software Supply Chain

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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