---
source: newsletter
source_url: https://www.theregister.com/security/2026/05/12/japans-pm-orders-cybersecurity-review-to-defend-against-anthropic-mythos/5238501
tags: [vietnam, cloud-computing, government, data-sovereignty]
url: https://www.theregister.com/security/2026/05/12/japans-pm-orders-cybersecurity-review-to-defend-against-anthropic-mythos/5238501
title: "Japan’s PM orders cybersecurity review to defend against Anthropic Mythos"
sha256: 099002afe2e3c41212ed18ec10085573e024a66fcb753a465ce07409c583d1d3
date: 2026-05-13
type: raw
review_value: 7
review_confidence: 8
review_recommendation: neutral
ingested: 2026-05-16
review_stars: 5
---
Published Time: 2026-05-12T05:40:37.000Z
Markdown Content:
# Japan’s PM orders cybersecurity review to defend against Anthropic Mythos
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REG AD
[Security](https://www.theregister.com/security)
# Japan’s PM orders cybersecurity review to stop Mythos going full CyberZilla
Fears exponential increase in attack scale and speed
Simon Sharwood[Simon Sharwood](https://www.theregister.com/author/simon-sharwood)APAC Editor
Published tue 12 May 2026 // 06:40 UTC
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Japan’s prime minister Sanae Takaichi has ordered a review of government cybersecurity strategy, citing the arrival of Anthropic’s bug-hunting model Mythos as a moment that makes it necessary to order a cabinet-level project.
In a Tuesday cabinet meeting, the PM instructed cybersecurity minister Hisashi Matsumoto to devise measures to check the state of government systems to determine whether it’s possible to detect and fix vulnerabilities, and to develop a plan to ensure critical infrastructure operators can do likewise.
Japan’s leader ordered the checks because she feels Mythos and similar frontier models may be misused, and that attacks on infrastructure may therefore increase in speed and scale – perhaps even exponentially.
REG AD
Over the last couple of years cybersecurity vendors and researchers have often pointed out that AI models make it possible to find flaws and automate attacks.
REG AD
## MORE CONTEXT
*   ### [Don’t blame AI yet for poor jobs numbers, analysts say](https://www.theregister.com/software/2026/03/06/dont-blame-ai-yet-for-poor-jobs-numbers-analysts-say/4119428)
*   ### [Anthropic’s bug-hunting Mythos was greatest marketing stunt ever, says cURL creator](https://www.theregister.com/security/2026/05/11/anthropics-bug-hunting-mythos-was-greatest-marketing-stunt-ever-says-curl-creator/5238111)
*   ### [Hackers ate my homework: Educational SaaS Canvas down after cyberattack](https://www.theregister.com/security/2026/05/08/hackers-ate-my-homework-educational-saas-canvas-down-after-cyberattack/5235561)
*   ### [Romance scammers turn sweet talk into £102M payday](https://www.theregister.com/security/2026/05/05/romance-fraudsters-fleeced-uk-victims-of-102m-in-2025/5227963)
When Anthropic [debuted Mythos in early April](https://www.theregister.com/security/2026/04/08/anthropic-mythos-model-can-find-and-exploit-0-days/5224393), the notion that AI has the potential to vastly complicate the security landscape went mainstream.
Many regulators around the world have issued guidance to point out that now is the perfect time to revisit and improve security strategies and capabilities, because Mythos and other AI models mean defenses are going to be tested like never before.
India’s securities regulator went a step further by [ordering a security review](https://www.theregister.com/security/2026/05/06/india-orders-infosec-red-alert-in-case-mythos-sparks-crime/5224961) at the organizations it oversees.
And now Japan’s leader has decided the matter is of sufficient importance that her office needs to weigh in and set new policy to ensure AI doesn’t go on a destructive rampage through Japanese infrastructure.
Whether Takaichi’s urgency is needed is open to debate. Some researchers have said that while Mythos can find bugs at speed, but doesn’t find flaws humans can’t [detect with their naked brains](https://www.theregister.com/software/2026/04/22/mythos-found-271-firefox-flaws-none-a-human-couldnt-spot/5223657). Others suggest Mythos is [not vastly better at finding bugs](https://www.theregister.com/security/2026/04/24/open-source-models-can-find-bugs-as-well-as-mythos/5224166) than open source models that pre-date it and are publicly available – unlike Mythos which is restricted to certain users.
Others have all but dismissed Mythos as a [marketing stunt](https://www.theregister.com/security/2026/05/11/anthropics-bug-hunting-mythos-was-greatest-marketing-stunt-ever-says-curl-creator/5238111). ®
.
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REG AD
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*   #### [Greater Manchester still says no to NHS data platform with Palantir at its heart Public concern has only grown, says ICB, while evidence of benefits remains thin](https://www.theregister.com/public-sector/2026/05/13/greater-manchester-still-says-no-to-nhs-data-platform-with-palantir-at-its-heart/5239584)
*   #### [Microsoft gives Windows Update a Ctrl-Z for bad drivers Cloud-powered undo will roll back dodgy code without users or hardware partners lifting a finger](https://www.theregister.com/oses/2026/05/13/microsoft-gives-windows-update-a-ctrl-z-for-bad-drivers/5239489)
*   #### [London cops hail fixed facial recognition cams after suspects collared every 35 mins Croydon trial helped secure 173 arrests, though civil liberties groups remain unconvinced](https://www.theregister.com/public-sector/2026/05/13/london-cops-hail-fixed-facial-recognition-cams-after-suspects-collared-every-35-mins/5239521)
*   #### [Linux gains more critical Windows apps: 3D Movie Maker and Space Cadet Pinball Further demonstrating its role as industry default OS the versatility of modern porting tools](https://www.theregister.com/oses/2026/05/13/linux-gains-more-critical-windows-apps-3d-movie-maker-and-space-cadet-pinball/5239455)
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*   [![Image 18](https://image.theregister.com/?imageId=226970&width=530&height=238&format=webp)### How agentic AI can strain modern memory hierarchies](https://www.theregister.com/special-features/2026/01/28/how-agentic-ai-strains-modern-memory-hierarchies/4429527)
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