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Risky Business #833 -- The Great Mythos Freakout of 2026

On this week’s show, Patrick Gray, Adam Boileau and James Wilson discuss the week’s cybersecurity news. They cover: Everyone has an opinion about Claude Mythos… even though almost nobody has used it yet CISA adds a 2009 Excel bug to the KEV list, u wot? Adobe also parties like it’s the 2000s, and fixes an Acrobat Reader bug Disgraced former Trenchant exec Peter Williams’ sob story fails to resonate with … anyone Remember those crosswalk buttons hacked to play audio mocking Trump and Zuck? They were “secured” by the password: 1234. This week’s episode is sponsored by mobile network operator, Cape. Ajit Gokhale talks with James about the ways to get being a telco right when you’re starting from scratch and solving the security problems of 2026. This episode is also available on Youtube. Show notes Lab Space The “AI Vulnerability Storm”: Building a “Mythosready” Security Program Polymarket on X: "JUST IN: Goldman Sachs is reportedly ramping up its cyber defenses in preparation for Claude Mythos." Ananay on X: "Marcus Hutchins probably has the best take on Mythos doing vulnerability research" solst/ICE of Astarte on X: "Th vast majority of CISOs do not work at Google-sized companies, and will not have to worry about 0days" Charlie Miller on X: "we’ve gone through this before with early fuzzers, afl, etc" James Kettle on X: "'Can AI Do Novel Security Research? Meet the HTTP Terminator' will premiere at Blackhat" jeffrey lee funk on X: "We've been tricked, again. Many of the thousands of bugs and vulnerabilities Mythos found are in older software are impossible to exploit." Claude is getting worse, according to Claude • The Register Your Agent Is Mine: Measuring Malicious Intermediary Attacks on the LLM Supply Chain OpenAI's Mac apps need updates thanks to the Axios hack | CyberScoop Hack at Anodot leaves over a dozen breached companies facing extortion | TechCrunch Snowflake customers hit in data theft attacks after SaaS integrator breach Booking.com confirms hackers accessed customers’ data CPUID hijacked to serve malware as HWMonitor downloads • The Register Known Exploited Vulnerabilities Catalog | CISA Adobe fixes PDF zero-day security bug that hackers have exploited for months | TechCrunch The Sad Decline of Trenchant Exec Who Had Everything, Before Deciding to Steal and Sell Zero Days to Russian Buyer FBI Extracts Suspect’s Deleted Signal Messages Saved in iPhone Notification Database US operation evicts Russia from hacked SOHO routers used to breach critical infrastructure | Cybersecurity Dive Telegram Is Still Hosting a Sanctioned $21 Billion Crypto Scammer Black Market | WIRED The Dumbest Hack of the Year Exposed a Very Real Problem | WIRED

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