Daily issue / 2026-09-19
Useful things that surfaced in Hacker News discussions on 2026-09-19. Open the context to see why each one caught our attention—or jump straight to the original thread.
What we found
A Ruby gem that confines external binaries with Linux Landlock sandboxes.
Source discussion: A heap overflow and SSO misconfiguration to compromise OpenAI internal repos
“we now run all external binaries, including magick via a landlock sandbox.”
sams99 · recommendation · production use
Direct HN comment
“I use ruby-landlock as well for image processing.”
kawsper · recommendation · first hand use
Direct HN comment
A self-hosted reverse proxy and VPN for public or authenticated private resources.
Source discussion: Cloudflare Quick Tunnels
“Use pangolin (you can self host), been using it for a while and it’s great”
tamimio · recommendation · first hand use
Direct HN comment
“I've been using Pangolin”
garettmd · comparison · first hand use
Direct HN comment
An open-source zero-trust overlay for identity-gated, otherwise invisible network services.
Source discussion: Cloudflare Quick Tunnels
“I have really enjoyed the experience of OpenZiti for this purpose.”
gibs0ns · recommendation · first hand use
Direct HN comment
Inception's low-latency diffusion language model for fast production reasoning.
Source discussion: OpenJev
“Mercury 2.5 is truly groundbreaking, giving it a try is highly recommended.”
Topfi · recommendation
Direct HN comment
A comparison site for checking LLM API prices and model costs.
Source discussion: Qwen 3.8 Omni Flash
“I use costgoat to be a cheapass”
deedree · recommendation · first hand use
Direct HN comment
A general-purpose allocator with profiling, memory controls, and per-thread counters.
Source discussion: Jemalloc 5.4.0
“Jemalloc is great for Ruby on Rails apps, and drastically reduces memory usage for the same workloads.”
collimarco · recommendation · production use
Direct HN comment
“I use Jemalloc on a project because it has per-thread allocation counters.”
atombender · recommendation · first hand use
Direct HN comment
A fast x86 and x86-64 userspace emulator for ARM64 Linux systems.
Source discussion: The scourge of x86 emulation
“this project (FEX) is amazing. I've been running Armada OS on multiple ARM handhelds”
sureglymop · recommendation · first hand use
Direct HN comment
A free open-source iPhone app blocker activated by NFC, QR, or barcodes.
Source discussion: Minimal Phone 2
“if you're struggling with apps on your (i)phone, I can't recommend”
olwmc · recommendation · first hand use
Direct HN comment
A minimalist keyboard-oriented Android launcher designed to reduce visual distraction.
Source discussion: Minimal Phone 2
“Olauncher has lasted the longest:”
Groxx · recommendation · first hand use
Direct HN comment
An article explaining why undefined behavior exists and where C and C++ overuse it.
Source discussion: C++26: Trivial infinite loops are no longer undefined behaviour
“I recommend this explanation of why UB is good and necessary”
ameliaquining · recommendation
Direct HN comment
A rigorous real-analysis textbook that builds mathematics methodically from first principles.
Source discussion: I vibed a proof of Conway's conjecture
“I highly recommend Terence Tao's Analysis textbook”
danabramov · recommendation · first hand use
Direct HN comment