Summary
Top cybersecurity Substacks provide in-depth analysis, industry trends, and technical insights from expert practitioners. Top, highly recommended, and frequently cited newsletters include Venture in Security (Ross Haleliuk), tl;dr sec (Clint Gibler), Aphinia (Misha Sobolev), Resilient Cyber, and The Cloud Security Guy, covering topics from CISO insights to AI and app security.
Why These Substack Newsletters?
- Actionable Advice: Many, like Resilient Cyber and Securely Built, offer practical tips for implementing security.
- In-depth Analysis: Unlike daily news alerts, these provide detailed, expert viewpoints on why a development matters.
- Focused Niches: Readers can choose specialized content, such as cloud (Cloud Security Guy) or, market analysis (Venture in Security).
Source: Google AI Overview. 2/16/26
OnAir Post: Substack Cyber Newsletters
About
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Technical, Cloud, & AppSec Focus
- tl;dr sec (Clint Gibler): A popular, high-quality weekly curation of application security,, conference talks, and tools.
- The Cloud Security Guy (Taimur Ijlal): Focuses on cloud security, AI implications, and career guidance.
- Resilient Cyber (Chris Hughes): Deep dives into software supply chain security, DevSecOps, and cloud security.
- Securely Built (Derek Fisher): Focuses on application security, product security, and Secure Product Lifecycle Management (SPLM).
- Detection at Scale (Jack Naglieri): Covers topics related to security detection, monitoring, and engineering.
TL;DR SEC
Source: Substack
tl;dr sec is a popular, free weekly cybersecurity newsletter curated by Clint Gibler that summarizes the best application security (AppSec), cloud security, and actionable research. Designed for busy security professionals, it focuses on high-value, practical tools, and techniques rather than news-cycle hype, reaching over 90,000 readers.
Key features of the newsletter include:
- Content Focus: Covers topics such as software supply chain security, AI-powered bug hunting, cloud-native detection engineering, and API security.
- Structure: Summarizes conference talks, technical blog posts, and new open-source tools to help professionals improve their workflows.
- Goal: The newsletter aims to act as a “too long; didn’t read” (TL;DR) for the security industry, highlighting essential information in a 7-minute read.
- Target Audience: Security engineers, application security specialists, and CISOs.
The newsletter is published every Thursday and is widely regarded as a high-density, technical resource.
Industry Trends & Strategic Insights
Source: Other
- Venture in Security (Ross Haleliuk): Focuses on cybersecurity investing, market trends, and industry analysis.
- Aphinia (Misha Sobolev): Weekly updates tailored for CISOs and security leaders.
- The Security Industry (Richard Stiennon): Analysis of the cybersecurity vendor landscape.
- Cyber Builders (Laurent Hausermann): Insights for building and scaling cybersecurity startups.
AI & General Security
Source: Other
- Deploy Securely: Analyzes risks at the intersection of AI and software security.
- Unsupervised Learning (Daniel Miessler): Explores the intersection of security, AI, and technology trends.
- Eric’s Substack (Eric Capuano): Focuses on security operations, incident response, and forensics.
