2026 Reliance Infrastructure — World Leaks extortion; 858K files posted; ~19K Kudankulam nuclear plant docs (Jul)

Verified partial breach — disclosed July 15, 2026. Anil Ambani's Reliance Group told Reuters a "partial breach" occurred on data hosted on a server operated by Indian data-centre provider Yotta Data Services. The World Leaks extortion group posted a cache of 858,000 files labelled as Reliance data; Reuters identified roughly 19,000 as the most sensitive subset tied to India's Kudankulam Nuclear Power Plant in Tamil Nadu. Reliance Infrastructure won a 2018 contract to design and build support infrastructure for Kudankulam Units 3 and 4 (2,000 MW combined, due online ~2027). Leaked materials purportedly include ventilation and cooling system blueprints, a common control room layout, vendor and supplier details, joint NPCIL–Reliance inspection records, and terrorism insurance documentation—Reuters could not fully verify authenticity. Yotta said it detected suspicious activity May 29, 2026, terminated it, and that Reliance flagged external leak claims in late June; Yotta shared forensic findings with Reliance. NPCIL has been communicating with Reliance; CERT-In is investigating per sources. Nuclear Threat Initiative's Nickolas Roth warned exposure could map adversary access paths to plant support systems. Distinct from Kudankulam's 2019 administrative-network malware incident. BreachHistory indexes Reuters-cited 858,000 total files with ~19,000 nuclear-plant-related subset.