Things I build, break, fix, and write about

5 November 2026
Embedded payloads in trojanised PDF viewers

Modified PDF viewers are a neat little delivery trick because they look like ordinary job bait until someone opens them. I keep coming back to the same point, the file name is not the danger, the loader path is; that is where the unwanted code slips in.

5 November 2026
Ransomware group fragmentation and detection priorities

Ransomware group fragmentation means the label matters less than the behaviour, and I trust activity over reputation every time. A small crew with...

5 November 2026
Security Advisory – 05 Nov 2026

Daily security advisory summary for 05 Nov 2026

4 November 2026
Linux kernel net/sched UAF constraints on CentOS 9 desktop

Linux kernel net/sched use-after-free looks messy on paper, and on CentOS 9 Desktop it is worse, because the obvious paths are blocked and the useful...

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23 August 2026
Testing agent boundaries before tool access widens

Frontier AI evaluations are only useful if they fail in the right places. If a model can keep itself safe until the last gate, then the gate is doing the work, not the model, and I would rather find...

22 August 2026
Skia integration for Rust image decoding

Chromium image codecs are where browser safety gets real, because malformed images arrive before anything else useful has happened. I like the Skia route for that reason; it keeps the ugly parsing...

22 August 2026
Styled output in macOS Terminal can leak data over DNS

macOS Terminal ANSI escape codes are one of those details I keep tripping over, because the wrong sequence can do more than colour text. I like this kind of bug precisely because it is small, ugly,...

21 August 2026
Tool boundaries in incident response for AI agents

When an autonomous AI intrusion lands, I care less about the model’s output and more about whether my tools still work. If a hosted service refuses the forensic workload, your response path is already...

21 August 2026
Flatpak pipewire escape through module loading

Flatpak PipeWire sandbox escape sounds tidy until you look at the PulseAudio path properly, where a length check passes for authentication and module loading stays open. Give a Flatpak...

20 August 2026
Founder-led startups and the cost of replacing generalists

AI can make founder-led startups look busier than they are, which is exactly why I distrust it when the team is already thin. The easy wins are real, but once you remove the generalist, you often...

20 August 2026
RCU and refcount faults in Linux kernel net/sched

RCU and refcount faults in the Linux kernel net/sched path are the sort of bug I like least, because the refcount check arrives after the damage is already done. On a busy CentOS 9 box, the race is...

19 August 2026
Simple Caddy access rules for cgit

I keep cgit behind Caddy access rules because the decision belongs at the front door, not buried in the app. It is a blunt setup, but it keeps browser noise out, leaves Git clients alone, and avoids...

19 August 2026
Skipping fenced code blocks in Neovim Markdown outline

Neovim Markdown outline navigation gets ugly fast if you let fenced examples count as headings. I fixed that with a small state flag, a blunt scan, and no ceremony; the sort of change that quietly...

18 August 2026
LLM-assisted pull requests and CLA friction

LLM-assisted pull requests tend to look harmless until the CLA, provenance, or disclosure rules kick in. I have seen good fixes stall there, not because the code was bad, but because the project had...