openbsd

A blog post detailing the ongoing revival and modernization of OpenBSD's relayd(8) and httpd(8) daemons, including efforts to modernize the imsg message system and address pending diffs, with the author citing LLMs as motivation to return to C programming.

A step-by-step guide to setting up a self-hosted web server on OpenBSD using httpd and WireGuard to tunnel through a VPS for IP hiding.

Game of Trees is a version control system from OpenBSD developers that prioritizes simplicity and uses Git repositories. Version 0.127 was released in July 2026.

A use-after-free vulnerability in OpenBSD through version 7.9 allows local attackers to escalate privileges to root. The flaw exists in sysv_sem.c and is identified as CVE-2026-57589.

The article discusses the final implementation of anti-return-oriented programming mitigations in OpenBSD.

This paper presents a longitudinal measurement study on the adoption of pledge and unveil system calls in OpenBSD, finding that adoption has steadily grown and that the system calls are relatively easy to adopt, contrary to common beliefs about sandboxing difficulties.

A blog post details the author's experience running OpenBSD on a Lemote Yeeloong laptop with a Chinese Loongson MIPS processor, discussing hardware, software challenges, and the free software philosophy.

A 27-year-old authentication bypass vulnerability in OpenBSD's PPP stack allows an attacker to gain full PPPoE access without credentials by sending zero-length username and password fields, exploiting a missing bounds check in the PAP handler. The same code also permits a kernel heap over-read.

In August 2002, the OpenSSH source tarballs on the OpenBSD FTP server were replaced with trojaned versions, leading to a security incident and response by the OpenBSD team.

A technical guide for fixing UTF-8 email encoding issues from cron on OpenBSD by creating a sendmail wrapper that encodes non-ASCII headers and adds Content-Type declarations before handing messages to dma.

Openrsync is a BSD-licensed reimplementation of rsync by the OpenBSD team, compatible with modern rsync protocol and supporting Unix systems.

Peter N. M. Hansteen describes his transition to OpenSMTPD as OpenBSD 7.9 drops exim, arguing that OpenSMTPD is the mail server for the 21st century.

OpenBSD 7.9 has been released, featuring platform-specific improvements for arm64, amd64, luna88k, riscv64, and other architectures, along with various bug fixes and enhanced hardware support.

This project provides patches and scripts to add experimental MAP-E CE (RFC7597) support to OpenBSD 7.8 routers, including kernel patches and a companion application called maped.

OpenBSD developer details the painful quirks of VAX floating-point exceptions and how they complicate kernel porting.