Releasing Execution Contexts (opens on the source site)
Two and a half years ago, with the invaluable support from 84codes, we re-examined the multithreading model inherited from Crystal 0.28 (preview MT).
Read at the sourceTHE COMPANY INDEX TRACKED BLOG
Crystal
Ideas, decisions, and lessons from the team.
crystal-lang.org (opens on the source site)LinkedIn X4Posts tracked
3 months agoLatest publication
0.3Posts / month over the last 12 months
Latest writing
4 of 4 postsPost Mortem: HTTP Request Smuggling Vulnerability (opens on the source site)
On 12 April 2026, we received a vulnerability report regarding an HTTP request smuggling vulnerability in HTTP::Server. The issue was caused by the HTTP request parser prioritizing the Content-Length header over the Transfer-Encoding header, which can lead to desynchronization when a proxy that prioritizes the Transfer-Encoding header sits in front of HTTP::Server for example. The vulnerability was patched in Crystal 1.20.0 and Crystal 1.19.2, following the mitigation from RFC 9112, Section 6.1 to always reject requests with both headers and to prioritize Transfer-Encoding then close the…
Read at the sourceOfficial Linux ARM64 builds (opens on the source site)
This has been a long awaited feature: how to run Crystal on ARM64 CPUs? Crystal has supported ARM64 as a tier 1 architecture for many years now, and we already distribute an universal build for macOS, but still no ARM64 builds for Linux. The wait is over! During the development of Crystal 1.19 we bootstrapped a 1.18.2 compiler for ARM64 that was then used to bootstrap official builds for nightlies and the 1.19 release. The builds are available everywhere we provide an AMD64 build of the compiler for Linux: nightly builds, release tarballs, Docker images, Snap, as well as the install-crystal…
Read at the sourceCrystal talk at FOSDEM 2026 (opens on the source site)
I’m giving a talk about Crystal at FOSDEM 2026 in Brussels: Crystal: A language for humans and computers. It’s in the Declarative and Minimalistic Computing track, on Sunday, 1 February 2026 at 09:00 in room UB4.136.
Read at the source