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Artwork for Calif
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blog.calif.io
Artwork for Calif

Latest Issues

OOBdump: Relocation Oriented Programming

We have a thing for finding bugs in bug finding tools. IDA Pro, Ghidra, Binja Sidekick, or radare2. You name it we hacked it. Our friends were saying we should try objdump. So here we go.

objdump -g should be boring. It reads an object f...

9 days ago
3

Codex Discovered a Hidden HTTP/2 Bomb

We’re publishing HTTP/2 Bomb, a remote denial-of-service exploit against most major web servers, including:

  • nginx

  • Apache httpd

  • Microsoft IIS

  • Envoy

  • Cloudflare Pingora

The vulnerable behavior exists in each server...

15 days ago
30
13

RedSun: Exploiting Windows Defender's Remediation Workflow for Local Privilege Escalation

Editorial note: We wrote this analysis 14 hours after RedSun was released, but other projects got in the way and it never made it to publication. Now that Nightmare Eclipse has been banned, it feels like a good time to finally share a detai...

16 days ago
7

Needle in a haystack: measuring the impact of two nginx RCEs

We had a lot of fun hacking nginx earlier this year. We know from experience that finding a real RCE in nginx is hard, especially one that triggers in a default or commonly-used configuration.

So when F5 disclosed CVE-2026-42945 (better kn...

19 days ago
7
1

An AI audit of FreeBSD

Since we started this campaign of hacking the Internet with AI, we’ve learned something many of you already knew: the Internet runs on volunteers. Projects that are critical to Internet security and culture are staffed by tiny groups of peo...

20 days ago
15

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