Vulnerabilities uncovered in secret US government systems and software during testing of Anthropic Mythos

Date:
Wed, 24 Jun 2026 16:00:00 +0000

Description:
The US Government confirmed what the community already knows - Mythos is a true beast.

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 Subscribe to our newsletter Senator Mark Warner testified NSA confirmed Mythos Preview identified vulnerabilities in nearly all classified systems within hours during a controlled exercise US officials clarified Mythos found flaws rapidly rather than exploiting them, but the capability still raises major concern Anthropic withheld public release, sharing only with select firms; Mozilla and others validated its potency,
with thousands of critical bugs uncovered in weeks We now have another
witness claiming Mythos Preview is able to break into protected systems fast and this one is none other than a high-ranking member of the US Government.

According to the Associated Press, Senator Mark Warner of Virginia testified in front of a congressional hearing this month, saying he was informed by National Security Agency (NSA) chief Joshua Rudd that Mythos broke into
almost all of our classified systems, not in weeks, but in hours. Its worth mentioning here that the break-in was controlled, since it was part of an exercise done by the Anthropic team and the intelligence agency. Latest
Videos From Watch full video here: How powerful is Mythos? The Associated Press dug deeper, and was informed by an unidentified US official that Mythos merely found vulnerabilities within hours, not necessarily exploited them. Still, identifying a vulnerability that theoretically can be exploited for attacks against protected US Government systems should be cause for concern
on its own.

Mythos is an advanced AI model built by Anthropic, first introduced in early April this year. However, the company decided not to share it with the
general public because it was apparently too capable of discovering and leveraging software vulnerabilities. You may like US security agency still using Mythos despite ban government using new security tool despite Pentagon's 'supply chain risk' designation Anthropic claims Mythos has found over ten thousand major security vulnerabilities Australia joins countries trialing Claude Mythos 'to make sure we are aware of emerging
vulnerabilities'

Instead, Anthropic shared it with a handful of major corporations, to help them secure their systems before cybercriminals can use the tool. Since then, multiple companies came forward to confirm Mythos potency, including Mozilla, which said the tool was every bit as capable as the worlds best security researchers.

Mozilla said that with the help of Mythos, it was able to ship more than 400 Firefox security bugs in April alone. 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
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A month later, Anthropic said the 50 companies using the tool discovered more than 10,000 critical and high-level security vulnerabilities in roughly two months time.

Several have told us that their rate of bug-finding has increased by more
than a factor of ten, the company said. For instance, Cloudflare has found 2,000 bugs ( 400 of which are high- or critical-severity ) across their critical-path systems, with a false positive rate that Cloudflares team considers better than human testers.

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