Malicious browser-targeting payload in debug 4.4.2
CVE-2025-59144 concerns a supply-chain compromise of the npm package debug. After the maintainer's npm publishing account was phished and taken over on 2025-09-08, an attacker published debug version 4.4.2. The package was functionally equivalent to the prior patch release but included an added malicious payload. The malicious code was intended to execute in browser contexts and attempt to redirect cryptocurrency transactions to attacker-controlled wallet addresses, reportedly targeting wallets and transaction flows such as MetaMask. According to the provided content, local development environments, server-side environments, and command-line applications were not affected by the payload's behavior. The issue was resolved in version 4.4.3, and subsequent patch releases were also published to help invalidate cached compromised artifacts in private registries and mirrors.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.