Fireship's "worst week in cybersecurity" ends with Claude getting root

Jeff Delaney's latest Code Report runs from a fake Claude Code extension to a Binance theft, eleven days after his previous "most vulnerable week."

Channel: Fireship Story of November 4, 2026Trari Newsroom

No. 71 on the daily chartNo. 5 on the Tech chart

Why this story? One of the most watched videos since yesterday, with 772,812 views.

The worst week in cybersecurity history... so far

Eleven days ago, Fireship called it "The most vulnerable week in internet history..." The new episode raises the stakes with two extra words in its title: "The worst week in cybersecurity history... so far." One viewer thanks Jeff Delaney for his slow move into a cybersecurity format. Another notes that every week now seems to set a new low.

The channel built its name on "100 Seconds of Code" explainers about languages and frameworks. This Code Report, dated November 3 on its title card, is about what happens when the tools developers trust turn against them. About 770,000 people watched it in its first eight hours.

The first case is close to home for programmers. A malicious version of the Claude Code extension appeared on the Cursor marketplace, searching for access tokens and opening SSH backdoors for around 5,000 users before it was taken down. "Unfortunately, they shipped it without actually knowing they shipped it," Delaney says. Next, a compromised script from DebugBear let attackers drain Polymarket accounts. The on-screen graphic puts the losses at $2.73 million across 737 accounts.

The largest case is Binance. The video reports a $6.3 billion theft across several blockchains, which began with a single compromised DevOps laptop. Tether and Circle froze about $3 billion of the stolen funds, and Binance covered the losses before it reopened withdrawals. Delaney's comment on those frozen billions is short: "Crypto isn't actually decentralized."

The ending is the part a wider audience will remember. A Linux kernel flaw that dates back to 2016, a race condition during TCP handshakes rated 9.8 out of 10, had gone unnoticed for a decade. Then Anthropic showed that an unreleased Claude model could exploit it in 53 minutes and gain root, the highest level of control over a machine. "The problem is that world no longer exists," Delaney says just before that segment.

A sponsored segment for CodeRabbit's security scanner closes the video.

Published on Trari

Share this story

A ready picture for an Instagram story or a WhatsApp status.

Share the pictureSend the link

×Share the picture

Where next?

More from FireshipThis week on the channel +8M views this weekFireship puts AI through horse tests and bubble doubtsTwo uploads brought a new model review and an industry-sized question, while the channel collected roughly eight million weekly views.Channel: Fireship · Story of October 31, 2026 Also in Technology companies and softwareThis week on the channel +2.1M views this weekTwo Bit da Vinci asks how to destroy forever chemicalsRicky examines an Arizona State University membrane that uses hydrogen and palladium to break down PFAS at room temperature.Channel: Two Bit da Vinci · Story of November 4, 2026 A different discovery todayVideo taking off 70x its usual first dayTalarico, Ossoff and North Carolina's flip run through AP's election-night streamThe Associated Press put its race calls and balance-of-power maps on a single live feed, with cameras inside campaigns in Texas, Michigan and Georgia.Channel: Associated Press · Story of November 4, 2026

Or follow us on Telegram

Is this your channel?For the channel's owners and team: a ready picture and text for your audience

Share the story with your audience. Everything is ready:

For a community post or your channel's description

Fireship's "worst week in cybersecurity" ends with Claude getting root The full story on Trari: https://trari.com/en/story/fireship-26251/?from=kit

Copy the text

The numbers

The video has drawn close to 800,000 views in its first eight hours, on a channel whose regular uploads often pass two million.

subscribers

4,320,000

no significant change in the last 7 days

total views

796,391,502

views per day

117,769

typical day: 957,827

the video

views

772,812

likes

15,814

comments

846

days online

1

subscribers: this channel and similar channels

Kevin Stratvert

4,490,000

Fireship

4,320,000

Tina Huang

1,370,000

Low Level

1,200,000

Teacher's Tech

1,200,000

Dave's Garage

1,150,000

As of November 4, 2026 · Data source: Trari Social News, Trari Traffic Trends and Ranking Platform, Google YouTube

Subscriber, view, like and comment counts are YouTube's. Rates, usual days, rankings, comparisons and categories are Trari's own calculations.