331
Government Rails Site Hit Hours After CVE Patch
Rietta patched a government client's Ruby on Rails site within hours of a 9.5 CVSS ActiveStorage CVE. Exploit attempts began before business hours resumed.
Topics /
Security & Privacy
The most popular blog posts about security & privacy on Hacker News. 362 posts.
332
Introducing selfie for sign-in: a new way to access your Google Account
Selfie video gives you more options if you’re ever locked out or don’t have access to your usual phone or computer.
333
Software sandboxing: The basics (2025)
Diving into the territory of software sandboxing is diving into mostly uncharted territory. The necessary pieces to implement good sandboxing in your software are scattered all-around and the pioneers haven’t yet gathered enough knowledge into an unified mappa mundi that can guide new sailors through some well…
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Entering and Breaking the Avast Antivirus Sandbox Part 2
SAFA details the full exploitation of CVE-2025-13032, turning a double-fetch vulnerability in Avast's kernel driver into a local privilege escalation to SYSTEM on Windows 11.
336
How the Government Deceived Congress in the Debate over Surveillance Powers (2013)
ANDREA MITCHELL: “Why do you need every telephone number? Why is it such a broad vacuum cleaner approach?” JAMES CLAPPER: “Well, you have to start someplace.”—NBC Meet the Press, this past Sunday Concerned about the surveillance of millions of ordinary Americans, last year Senator Ron Wyden asked...
337
Italy Blocks Reproductive Health Websites Women on Web and Women Help Women
This report documents the blocking of Women on Web (WoW) and Women Help Women (WHW) domains in Italy based on OONI data.
338
The Anti-Palantir Manifesto
Nym CEO Harry Halpin responds to Palantir manifesto with one that defends human freedom and privacy against techno-fascism.
339
Superhuman AI Exfiltrates Emails
Superhuman AI was able to exfiltrate sensitive emails from user accounts - without the user even being aware. This vulnerability was rapidly remediated by the Superhuman team.
340
We found cryptography bugs in the elliptic library using Wycheproof
Trail of Bits discovered and disclosed two vulnerabilities in the widely used elliptic JavaScript library that could allow signature forgery or prevent valid signature verification, with one vulnerability still unfixed after the 90-day disclosure window.
341
Sandboxes won't save you from OpenClaw
AI agent misbehavior isn't a sandbox problem—it's a permissions problem.
342
A 32-year-old bug walks into a Telnet server
A long, long time ago, in a land free of binary exploit mitigations, when Unix still roamed the Earth, there lived a pre-authentication Telnetd vulnerability. In fact, this vulnerability was born so long ago (way back in 1994) that it may even be older than you. To put the
343
AI Meets Cryptography 1: What AI Found in Cloudflare's Circl
We pointed our AI audit pipeline at Cloudflare's CIRCL experimental cryptography library and confirmed seven real bugs, from a critical float64 precision loss in threshold RSA to a complete access-control break in attribute-based encryption. All seven are now fixed upstream. This is the first post in a series on bugs…
344
An algorithmic failure beneath the secret ballot
The secret ballot is one of the load-bearing walls of democracy. In Georgia, as in most states, this allows you to know whether your neighbor voted, but never who they voted for. Yet, in multiple states including Georgia, that guarantee is actively at risk.
345
We reproduced Anthropic's Mythos findings with public models
Anthropic framed Mythos and Project Glasswing as proof that frontier AI vulnerability research now needs gated access. We tested the public, patched cases with GPT-5.4 and Claude Opus 4.6 and found that the key building blocks are already accessible outside Glasswing, while reliable operationalization remains the real…
346
Prove you are a robot: CAPTCHAs for agents
How we built a reverse-CAPTCHA for agents, and what we learned.
347
OEMpocalypse: Unprivileged Android app to root on Samsung, Xiaomi, others
Part 1 of a series that takes an unprivileged Android app to root on Samsung, Xiaomi, and Oppo/OnePlus/Realme devices, with a single strategy.
348
How Cloudflare responded to the “Copy Fail” Linux vulnerability
When a critical Linux kernel privilege escalation was publicly disclosed, Cloudflare's security and engineering teams detected, investigated, and mitigated the threat across our global fleet, confirming zero customer impact and no malicious exploitation.
349
Sending Data over Offline Finding Networks
The following is a summary of an internal research project conducted by Hudson H. and Andrew G.
350
OpenAI's response to the Axios developer tool compromise
OpenAI responds to the Axios supply chain attack by rotating macOS code signing certificates, updating apps, and confirming no user data was compromised.
351
OpenSSL: Stack buffer overflow in CMS AuthEnvelopedData parsing
Show issues fixed only in OpenSSL 4.0 , 3.6 , 3.5 , 3.4 , 3.3 , 3.2 , 3.1 , 3.0 , 1.1.1 , 1.1.0 , 1.0.2 , 1.0.1 , 1.0.0 , 0.9.8 , 0.9.7 , 0.9.6 .
352
Data-only attacks are easier than you think (2024)
Data-only attacks, those that do not affect a program’s control flow, have long been considered too sophisticated and niche to pose a practical threat. With our research, however, we have built a tool that automatically generates them with surprising ease. We explain how such attacks work, and why our tool, Einstein…
353
CSS: The bomb inside your inbox
Gareth Heyes - gareth.heyes@portswigger.net - @garethheyes It's quite common for webmail clients to render untrusted CSS in a trusted UI. They attempt to make this safe using CSS sanitization. In this
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AI Meets Cryptography 2: What AI Found in OpenVM's ZkVM
We turned zkao (our AI auditor) on OpenVM, a state-of-the-art zkVM, and it found a critical soundness bug: the pairing check accepted a prover-supplied witness without proper subfield checking, which lets a malicious prover forge any pairing equality. It is fixed in OpenVM 1.6.0 and tracked as CVE-2026-46669. This is…
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Detecting and Preventing Distillation Attacks
We identified coordinated distillation attacks using ~24,000 fraudulent accounts to extract Claude's capabilities.
358
How Claude's text watermarking works
Future Claude models will generate text that contains a watermark to comply with the EU AI Act. We answer questions about how it works and whether it affects outputs.
359
Due to concerns about malicious applications, GPT2 will not be released (2019)
We’ve trained a large-scale unsupervised language model which generates coherent paragraphs of text, achieves state-of-the-art performance on many language modeling benchmarks, and performs rudimentary reading comprehension, machine translation, question answering, and summarization—all without task-specific training.
360
CVE-2026-98432: 9.8 CVE affecting all Ubuntu versions
Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.