On October 20, 2026, GitHub opened a public preview of a firewall that sits between Actions runners, coding agents and the npm registry, inspecting metadata requests and package downloads alike. It blocks malware at install time, where scanners show up too late: turn it on if your CI installs third-party code.
On October 17, 2026, SafeDep, Checkmarx and CloudSEK document the MALFEX campaign, which has been publishing npm packages since August 2023 whose nine-line JavaScript files load a DLL that injects shellcode into a Windows process. If your Windows machines install npm dependencies with native addons, audit your dependency trees and treat affected hosts as compromised.
The actions-cool/issues-helper and maintain-one-comment actions, compromised on 18 May 2026 in the Mini Shai-Hulud campaign, were re-enabled on 16 September with tags still pointing at malicious code, according to Socket. The lesson is blunt: in CI/CD, a mutable tag is a door left open.
On September 18, 2026, a joint advisory from the FBI, Japan’s police, and several agencies revealed that WaterPlum, a North Korean group, infected more than 30,000 devices across 100-plus countries and siphoned $10.7 million in cryptocurrency through fake job interviews and poisoned repositories. Verify contractor identities and limit their access to source code and credentials.
On September 18, 2026, CrowdSec revealed that an attacker copied about 170 private GitHub repositories in May using the account of a former employee whose access had never been revoked. The initial compromise came from TanStack’s malicious npm packages, which also hit Mistral AI and OpenAI.
On August 20, 2026, Trend Micro disclosed fourteen functional npm packages that drop RedShell, the Linux beacon of the RedC2 4.0 C2 framework, with no install hook and no exported function call. Audit your transitive dependencies and recent package additions before a single import compromises your servers.
From TanStack to Trellix via GitHub Megalodon, the five biggest supply chain attacks of 2026 prove your attack surface extends to every npm install. Third-party risk management must become continuous — the annual questionnaire is dead.
A self-propagating supply-chain attack named ChainDrop compromised over 1,300 packages on the npm registry on August 4, 2026. The infected packages accounted for 2 billion monthly downloads and reached organizations including Deliveroo, Qlik, and ServiceTitan. Audit your dependencies now.
