Reletter
Artwork for Calif
Platform
Substack
PricingOnly free issuesPublishesWeekly
Issues58Founded3 years agoLast Issue6 days ago
Active

Read this Newsletter

blog.calif.io
Artwork for Calif

Latest Issues

Dark Elevator: Windows Install Service Local Privilege Escalation (CVE-2026-50343)

Today we walk through Dark Elevator, a LPE in Windows 11. We reported it to Microsoft on May 20, 2026, and it is now fixed as CVE-2026-50343.

A normal user can cause InstallService, the SYSTEM service behind the Windows app install pipel...

6 days ago
7

Journey to Root, Episode I: The Maglev King

Table of Contents

  • Introduction

  • Why Do We Do This?

  • So, Where Were All The Humans?

  • Anatomy Of An Exploit Chain

  • Renderer Exploit Chain Overview

  • Act I: A Forgotten Barrier That Derails Maglev

    • Core Concept...
11 days ago
11
4

MAD Bugs: My Cousin Vinyl (CVE-2026-50052)

So the story went like this: Squid was bleeding from a 29-year-old heap overread in her default config. Naturally, she did the only sensible thing: she called her cousin, Vinyl.

Squid and Vinyl are family: both are HTTP caching proxies wri...

a month ago
8

Squidbleed (CVE-2026-47729)

Two weeks ago, we dropped an HTTP/2 bomb cooked up by Codex Cyber. This time, we sent Claude Mythos Preview spelunking through Squid’s guts, and it surfaced clutching a 29-year-old bug.

Meet Squidbleed: a Heartbleed-style vulnerability tha...

a month ago
8
5

Apple Internals: Swift in the Kernel

After WWDC, I saw Devon Maloney posted a slide saying Apple has “started writing parts of the core operating system kernel in Swift” for the 27 releases. First steps toward a memory-safe kernel. What does this even mean?!

Naturally I dropp...

a month ago
22

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.

SubscribersEngagement77Monthly 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
  • Thai Duong
  • Josh Maine

    That Apple internals guy

  • Jun Rong

    Security researcher at 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.