Mythos and friends could be a 'net positive' for UK cyber security defenses but only if they're secured, says top cyber official

Date:
Wed, 22 Apr 2026 10:13:18 +0000

Description:
Mozilla can attest to that after using Mythos to find 271 bugs in Firefox 150.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Tech Radar Pro Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Become a Member in Seconds Unlock instant access to exclusive member features. Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over. You are
now subscribed Your newsletter sign-up was successful Join the club Get full access to premium articles, exclusive features and a growing list of member rewards. Explore An account already exists for this email address, please log in. Subscribe to our newsletter NCSCs Richard Horne says hacking AI tools
like Mythos Preview can strengthen defenses if guardrails are in place Anthropics Mythos Preview, part of Project Glasswing, finds zerodays at scale Horne argues frontier AI exposes weak fundamentals quickly, giving defenders
a chance to decisively outpace cybercriminals With proper guardrails and safety regulations, hacking AI tools such as Mythos Preview can be net positive for cybersecurity defenses everywhere, says Richard Horne, head of the National Cyber Security Centre (NCSC).

According to the BBC, Horne echoed these statements in a speech to the NCSCs annual conference CyberUK, on Wednesday. "As we have seen in the media in recent days, frontier AI is rapidly enabling discovery and exploitation of existing vulnerabilities at scale, illustrating how quickly it will expose where fundamentals of cyber-security are still to be addressed," he said. Article continues below You may like OpenAI reveals its Mythos rival designed for cybersecurity pros Project Glasswing wants to use AI to prevent AI cyberattacks AI powers innovation but its also powering the next wave of cyber attacks This time is different Earlier this month, Anthropic announced
a new security initiative called Project Glasswing, and at its heart, the newest AI model, Mythos Preview. This model was apparently so good at discovering and exploiting zero-day vulnerabilities, that Anthropic decided
to only give it to a handful of large software companies. That way, these companies can get a head start against bad actors, before the model is released to the general public at a (yet undetermined) later date.

There is also plenty of chatter online about this being just a PR stunt, with some people stating that OpenAI did the same for GPT-2 which later turned out to be a lot more benign.

However, this time it really might be different. The Mozilla Foundation said that with the help of Mythos it managed to find 271 vulnerabilities in
Firefox 150, the famed browsers latest build. When it tried a similar thing with an earlier model - Opus 4.6 against Firefox 148 - it found just 22 bugs.

Announcing the results, Mozilla CTO Bobby Holley couldnt hide his excitement, hinting that the cat-and-mouse fight against cybercriminals might finally
come to an end. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners
or sponsors By submitting your information you agree to the Terms &
Conditions and Privacy Policy and are aged 16 or over.

Our work isnt finished, but weve turned the corner and can glimpse a future much better than just keeping up, he wrote. Defenders finally have a chance
to win, decisively.

Via BBC The best antivirus for all budgets Our top picks, based on
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Read our full guide to the best antivirus 1. Best overall: Bitdefender Total Security 2. Best for families: Norton 360 with LifeLock 3. Best for mobile: McAfee Mobile Security Follow TechRadar on Google News and add us as a preferred source to get our expert news, reviews, and opinion in your feeds.



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