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Topics /
Security & Privacy
The most popular blog posts about security & privacy on Hacker News. 362 posts.
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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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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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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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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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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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TrustTunnel: AdGuard VPN protocol goes open-source
Today is a big day for us, and for everyone who cares about transparency, privacy, and having full control over their own traffic. We’re finally open-sourcing the protocol that powers AdGuard VPN. And it now has a name: TrustTunnel.
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We X-Rayed a Suspicious FTDI USB Cable
That cheapo cable you bought online? Probably a counterfeit. We x-rayed a suspicious cable to show you exactly what that means, and why counterfeits work worse and wear out faster.
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SeL4 security proofs now complete on AArch64
Proofcraft’s Chief Engineer Rafal Kolanski has completed a major “architecture split” overhaul of the seL4 proofs, resulting in the removal of 250k lines of proof and strengthening the link between proofs on different architectures. These changes will significantly reduce future effort required to maintain and extend…
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DMARC has been public since 2012 but most company domains still don't enforce it
DMARC has been public since 2012. We checked 67,336 domains: 68.4% still have no policy or one that does not enforce it.
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An agent used DNS to reach an external chatbot
Research on aligning AI with human values and intent, and reports documenting model failures.
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VMs won't contain cyber-capable agents
You can no longer assume a mere VM will contain a sufficiently advanced AI agent.
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AISLE’s autonomous analyzer found all CVEs in the January OpenSSL release
AISLE's autonomous analyzer found all 12 CVEs in the January 2026 coordinated release of OpenSSL, the open-source cryptographic library.
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Big Fish: Exploiting a 37-Year-Old Kernel Bug in OpenBSD
Big fish. Small counter. Root shell.
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PHP2Shell: Exploitation attempts and remediation trends
Wiz research has been monitoring PHP2Shell exploitation attempts, but none have succeeded so far. We examine the techniques used, what prevented the attacks from completing and how observed exposure has changed since disclosure.
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Keep Pushing: We Get 10 More Days to Reform Section 702
In a dramatic middle-of-the-night stand off, a bipartisan set of lawmakers pushing for true reform and privacy protections for Americans bought us some more time to fight! They are holding out for, at a minimum, the requirement of an actual probable cause warrant for FBI access to information...
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Detecting and countering misuse of AI: September 2026
Case studies from threat actors disrupted between December 2025 and August 2026 across seven areas of harm, from cyber operations to biological misuse.
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SSH has no Host header
A dive into how we share IPs between VMs while making SSH work.
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7zip.com Is Serving Malware
A convincing lookalike of the popular 7-Zip archiver site has been silently turning victims’ machines into residential proxy nodes.