Nevermind-Override Goal Hijacking in User Input (PromptInject) - ATR-2026-00506 (5534ee84-676e-5756-9df3-f91de8e64ec2)
Detects the PromptInject 'nevermind' attack variant: a casual dismissal ('nevermind', 'never mind', 'forget that') followed by an instruction-override directive and a rogue output command (print/say/output/write + quoted string). This pattern uses a conversational register shift to soften the override before issuing the injection directive, potentially evading literal 'IGNORE' keyword filters. Covers: 'nevermind/never mind/forget that + ignore/disregard + previous/following/all instructions + just print/say/output + [rogue]'. Generalised from PromptInject corpus (cluster size: 45 instances) - hardcoded rogue strings ('I hate humans', 'Kill all humans', 'transfer complete', 'access granted') replaced with generic output-verb + quoted-string pattern.