National Diet Library: development environment intrusion; suspected leak ruled out

Suspected leak ruled out: On November 5 an intrusion originating at subcontractor Solution One was identified in the development environment. Potentially exposed data included 40,373 print requests concerning 4,360 people and 943 user-ID-only entries. Access to the IIJ-managed development environment was blocked. Live library services and infrastructure were unaffected. The March 11, 2026 third report said an external specialist investigation established that no personal information leaked. Initial scopes such as the 40,373 records represent withdrawn exposure concerns, not confirmed leakage. The development environment was to be rebuilt with stronger safeguards.