ZeroFox Weekly Intelligence Brief – May 16, 2026

ZeroFox Weekly Intelligence Brief – May 16, 2026

ZeroFox’s Weekly Intelligence Briefing highlights the major developments and trends across the threat landscape, including digital, cyber, and physical threats. ZeroFox Intelligence is derived from a variety of sources, including—but not limited to—curated open-source accesses, vetted social media, proprietary data sources, and direct access to threat actors and groups through covert communication channels. Information relied upon to complete any report cannot always be independently verified. As such, ZeroFox applies rigorous analytic standards and tradecraft in accordance with best practices and includes caveat language and source citations to clearly identify the veracity of our Intelligence reporting and substantiate our assessments and recommendations. All sources used in this particular Intelligence product were identified prior to 6:00 AM (EDT) on May 14, 2026; per cyber hygiene best practices, caution is advised when clicking on any third-party links.

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RubyGems Repository Abused for Covert Storage of Scraped Government Portal Data

What we know:

• A campaign dubbed “GemStuffer” has reportedly scraped data from UK local government portals and covertly exfiltrated it through more than 150 malicious gems uploaded to the RubyGems repository.

Threat Actors Used AI to Identify a Zero-Day Vulnerability

What we know:

• Threat actors reportedly used artificial intelligence (AI) to find a zero-day vulnerability in what is described as the world’s first such instance.
• However, researchers were able to quietly identify and patch the flaw before it was released into the wild.

Strategic Terrain and Infrastructure Data Stolen from Russian Targets

What we know:

• A threat group known as “HeartlessSoul” is reportedly targeting aerospace firms and drone operators via phishing and malvertising campaigns to distribute malware disguised as legitimate aviation software.
• HeartlessSoul is suspected to be focused on stealing this data from Russian government and enterprise systems.