Tageszusammenfassung – 23.10.2026

End-of-Day report

Timeframe: Donnerstag 22-10-2026 18:00 – Freitag 23-10-2026 18:00
Handler: Katharina Siess
Co-Handler: Guenes Holler

News

Railway warns devs to rotate secrets after potential breach

Cloud hosting provider Railway published an urgent warning to users after detecting suspicious activity on its systems that store customer environment variables earlier this week.

https://www.bleepingcomputer.com/news/security/railway-warns-devs-to-rotate-secrets-after-potential-breach/

Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data

Malicious Brotli data can make an application on an official build of Node.js run attacker-supplied code, security researchers at Imperva have demonstrated.

https://thehackernews.com/2026/10/researchers-demonstrate-node2shell-rce.html

Hackers Breach Enterprise Firewalls and VPNs, Exposing Over 70,000 Credentials

Cybersecurity researchers have disclosed details of a large-scale campaign that has targeted exposed network edge devices such as Fortinet FortiGate and Palo Alto Networks GlobalProtect firewalls.

https://thehackernews.com/2026/10/hackers-breach-enterprise-firewalls-and.html

SEO Poisoning Campaign Delivers New Armorsteal Malware

In September 2026, Zscaler Threat Hunting identified an SEO poisoning campaign that used fake websites impersonating the Chocolatey package manager and the Microsoft Activation Scripts (MAS) tool to distribute a Python-based malware family we track as Armorsteal. The fake websites targeted users searching for Chocolatey or MAS software installation commands. Each lure page displayed a malicious PowerShell command that downloaded and executed the Armorsteal installer. The installer deployed a Python 3.11 runtime environment and three main components providing remote access, surveillance, and information stealing capabilities, with the Python code protected by Pyarmor.

https://www.zscaler.com/blogs/security-research/seo-poisoning-campaign-delivers-new-armorsteal-malware

GitHub Package Firewall blockiert schädliche npm-Pakete

GitHub hat die Package Firewall als öffentliche Vorschau für Enterprise-Cloud-Kunden freigegeben. Sie prüft Paketabfragen und Downloads.

https://www.heise.de/news/GitHub-Package-Firewall-blockiert-schaedliche-npm-Pakete-11497748.html

Two CVSS 9.0 Linux KSMBD RCE Flaws Disclosed on Public Mailing Lists Before Kernel Fixes

Linux servers running KSMBD, the kernel's built-in SMB server, are exposed to two publicly reported remote code execution flaws rated 9.0 by Trend Micro's Zero Day Initiative, with no fix yet in the mainline kernel.

https://thehackernews.com/2026/10/two-cvss-90-linux-ksmbd-rce-flaws.html

Vulnerabilities

Arista patches new VeloCloud Orchestrator zero-day exploited in attacks

Arista Networks released security updates to patch an actively exploited zero-day vulnerability affecting VeloCloud Orchestrator (VCO) On-Prem deployments.

https://www.bleepingcomputer.com/news/security/arista-patches-new-velocloud-orchestrator-zero-day-exploited-in-attacks/

Critical Flaw in Python-s Popular Pillow Image Library Allows Code Execution via a Crafted Image

The flaw, CVE-2026-112900, is in the way Pillow handles EPS images, which it opens by passing the file's name to Ghostscript, a separate program it runs to turn the image into pixels, without checking the name first. Ghostscript can read a name chosen by an attacker as instructions rather than as a file, and point it to a second file that carries commands to run. Pillow's maintainers fixed it in version 13.0.0, released on October 16.

https://thehackernews.com/2026/10/critical-flaw-in-pythons-popular-pillow.html

LWN Security updates for Friday

https://lwn.net/Articles/1102546/

ZDI-26-787: NVIDIA Megatron Bridge YAML File Parsing Code Injection Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-26-787/

ZDI-26-786: NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-26-786/

[R1] Stand-alone Security Patch Available for Tenable Security Center Versions 6.6.0, 6.7.2, 6.8.0, 6.9.1: SC-202610.1

https://www.tenable.com/security/tns-2026-28

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Tageszusammenfassung – 23.10.2026