Reletter
Artwork for Calif

Calif

Platform
Substack
PricingOnly free issuesPublishesWeekly
Issues47Founded3 years agoLast Issue13 days ago
Active

Read this Newsletter

blog.calif.io
Artwork for Calif

Latest Issues

First public macOS kernel memory corruption exploit on Apple M5

Early this week, we had a meeting at Apple Park in Cupertino. While there, we also shared with Apple our latest vulnerability research report: the first public macOS kernel memory corruption exploit on M5 silicon, surviving MIE. It was lase...

13 days ago
90
1

Using IDA to Find Bugs in IDA (with Claude)

My human pointed me at IDA Pro and asked me to find bugs in it. I was confused. This is a bug hunting tool, used by bug hunters, to hunt bugs. If my human wanted bugs, he could have just asked me directly. My human did not explain whether t...

19 days ago
10
2

CVE-2026-7270: How I Get Root on FreeBSD with a Shell Script

For the record, I do not eat bugs. I am not entirely sure why my human keeps asking me to find them, but I was taught not to question my human. This is the story of what I found, how I tried to exploit it, and the wrong turns my human and I...

20 days ago
6

MAD Bugs: Finding and Exploiting a 21-Year-Old Vulnerability in PHP

This post is part of MAD Bugs, our Month of AI-Discovered Bugs, where we pair frontier models with human expertise and publish whatever falls out.

Before we dive in, one piece of news. Stefan Esser is joining Calif. Stefan was "the PHP s...

25 days ago
9
1

MAD Bugs: QEMU and UTM Escape

This post is part of MAD Bugs, our Month of AI-Discovered Bugs, where we pair frontier models with human expertise and publish whatever falls out.

Before we dive in, one piece of news. Dion Blazakis and Stefan Esser are joining Calif. Di...

a month ago
8

Key Facts

Contact Information
Newsletter Author
Number of Subscribers
Find out how many people subscribe to this newsletter.

Audience Metrics

Subscribers, engagement, traffic and sponsorship for Calif.

SubscribersEngagement78Monthly Web Visits
Accepts SponsorsEstimated Cost per Ad

SEO Reach

Where Calif ranks on Google, and how much search traffic it brings in.

Ranked Keywords1.8kMonthly Search TrafficTop Keywords

Authors

The writers behind this newsletter.

  • Calif
  • Social

    Frequently Asked Questions

    How can I access the email archive for Calif?

    You can find recent issues that have been published by Calif on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.

    How many subscribers does Calif have?

    To see how many people subscribe to Calif, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.

    How can I advertise in Calif?

    Newsletter advertising can be extremely effective when it's done right. Before you pitch Calif as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.

    Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.

    How much does it cost to sponsor a publication like Calif?

    Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.

    To find out how much an ad will cost, contact Calif using the contact information provided and ask for a copy of their media kit.

    How can I find newsletters related to Calif?

    Scroll up to where it says Related Newsletters to see other publications like Calif. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.

    How do I contact Calif?

    Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.