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Security & Privacy
The most popular blog posts about security & privacy on Hacker News. 717 posts.
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Court Filings: ICE App Identifies Protesters; Global Entry, PreCheck Get Revoked
ICE is using a smartphone app called “Mobile Fortify” to scan faces and capture contactless fingerprints, instantly pulling back names and biographical data — and court filings say the same encounters are being followed by revocations of Global Entry and TSA PreCheck. That turns “trusted traveler” into chilling of…
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Don't Trust the Salt: AI Summarization, Multilingual Safety, and LLM Guardrails
“The devil is in the details,” they say.
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The React2Shell Story
The story of CVE-2025-55182 (React2Shell)
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macOS's Little-Known Command-Line Sandboxing Tool (2025)
AVAILABLE NOW OpenAI, Anthropic, and Chrome ship it. Apple deprecated it. Nobody documented it. Until now. → sandbox-exec: The Miss...
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Welcoming the Nepalese Government to Have I Been Pwned
Today, we welcome the 47th government onboarded to Have I Been Pwned’s free gov service: Nepal. Their National Cyber Security Centre now has access to monitor Nepalese government domains against the data in HIBP. This gives the NCSC the ability to identify exposure across government email addresses and respond
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OpenAI DayBreak – GPT-5.5-Cyber
OpenAI introduces new Daybreak tools, including Codex Security and GPT-5.5-Cyber, to help organizations find, validate, and patch vulnerabilities at scale.
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Plex vulnerabilities being exploited in the wild to drop a cryptominer
Intro: (No AI was involved in writing, research, etc...) If you see weird fonts and spacing, blame Blogger. Skip to "In the wild exploitati...
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A most elegant TCP hole punching algorithm
The algorithm in this post needs “double buckets” to be reliable. Otherwise, the two sides can split on bucket boundaries and fail to converge. If the first bucket fails, compute an additional bucket step for convergence. My algorithm trades slow startup for less infrastructure.
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Securing a DoD contractor: Finding a multi-tenant authorization vulnerability
Zero tenant isolation, exposed military training data, and a five-month responsible disclosure timeline.
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Photon-Emission-Guided Laser Fault Injection Enables RP2350 Secure Debug
Differential photon-emission microscopy localized debug enable register activity and narrowed the laser search before SWD-guided injection set the two bits required to restore Secure debug on an RP2350 A4.
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We want Texans to know their rights
Last May, EFF reported that a sheriff’s office in Texas searched data from more than 83,000 automated license plate reader (ALPR) cameras to track down a woman suspected of self-managing an abortion. ALPRs are promoted as tools for keeping communities safe by finding missing persons and locating...
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Understanding the recent DDoS attack against Read the Docs
A deep dive into the massive June 2026 DDoS attack on Read the Docs, the attack patterns we observed, and the mitigations and defenses we used to defend our infrastructure.
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Android NAT-T keepalive offload bypasses VPN lockdown
Technical report on Android VPN lockdown bypass via NAT-T keepalive offload.
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Is this the new cyber normal?
A week of cyber incidents one after another – is this what every week is going to look like and what can we do about it?
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Memory Safe Context Switching
This document describes how Fil-C supports longjmp , setjmp , setcontext , getcontext , makecontext , and swapcontext in a totally memory-safe way. In particular, no misuse of those APIs in Fil-C can lead to stack corruption or any other violation of Fil-C's capability model.
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Eurostar AI vulnerability: When a chatbot goes off the rails
TL;DR Introduction I first encountered the chatbot as a normal Eurostar customer while planning a trip. When it opened, it clearly told me that “the answers in this chatbot are generated by AI”, which is good disclosure but immediately raised my curiosity about how it worked and what its limits were. Eurostar…
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Bad Connection: Global telecom exploitation by covert surveillance actors
Our investigation uncovers two sophisticated telecom surveillance campaigns and, for the first time, links real-world attack traffic to mobile operator signalling infrastructure. The findings expose how suspected commercial surveillance vendors (CSVs) exploit the global telecom interconnect ecosystem, leverage private…
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SendGrid isn’t emailing about ICE or BLM – it’s a phishing attack
For the past several months, I’ve been receiving and then ignoring a steady stream of concerning emails from Sendgrid, the popular email delivery service owned by Twilio that I use for sendin…
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The relay market powering token resellers and fraud
A look inside the gray-market reseller economy that gives mainland China cheap, structured, B2B-grade access to OpenAI, Anthropic, Google, and beyond
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A €0.01 bank transfer could compromise a banking AI agent
Blue41 helps regulated organizations monitor AI agent behavior, detect manipulation and misuse, and prove that sensitive workflows stay within safe boundaries.
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Microsoft has released software updates to plug at least 570 security holes
Microsoft Corp. today released software updates to plug at least 570 security holes in its Windows operating systems and other software, almost triple the number of vulnerabilities the software giant fixed in its record-smashing Patch Tuesday release last month. Microsoft attributed the burgeoning patch counts to…
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Security through obscurity is not bad
Why security through obscurity still matters: not as your only defence, but as a practical layer that raises attacker cost.
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Cloudflare OHTTP gateway
We’re announcing the closed beta of a self-serve Cloudflare OHTTP Gateway. We’re also renaming our Privacy Gateway to Cloudflare OHTTP Relay to better distinguish the two products.
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Responding to the next frontier of critical cyber capabilities
OpenAI is sharing preliminary cybersecurity evaluations for Astra and the steps we’re taking to strengthen safeguards and security controls.
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Notion AI: Unpatched data exfiltration
Notion AI was susceptible to data exfiltration via indirect prompt injection due to a vulnerability in which AI document edits are saved before user approval.
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You Want to Visit the UK? You Better Have a Google Play or App Store Account
New immigration rules for the UK are being enforced starting February 2026. This means citizens of 85 additional countries (including the USA and European countries) will need an Electronic Travel Authorisation (ETA) to visit, even for tourism. Luckily, you can apply (and pay) digitally. Unfortunately, the government…
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Stopping the smart TV from being used against you
Smart TVs are everywhere! But who is the master? Amid the electronics boom driven by A.I., one piece of electronics has remained almost unchanged financially. That is the digital display or flat-panel monitor. With good reason! The entire entertainment and streaming industry wants one of these devi