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The global 'seen' set allowed anchored subtrees validated at a shallow depth to be skipped when later referenced via alias at a greater depth. This could let effective nesting exceed MaxYAMLDepth, enabling DoS. Fix: replace the single 'seen' set with two tracking maps: - validated (node -> min depth): only short-circuits when current depth <= previously validated depth; re-checks at deeper contexts. - visiting (node -> bool): per-path recursion stack for true cycle detection (breaks alias loops without suppressing depth checks). Add TestYAMLAliasDepthBypass that constructs a document with an anchored 15-level subtree referenced via alias under 6 levels of nesting, verifying the combined effective depth (22) is rejected. Addresses security-review-bot findings on review #2774.