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OWASP Gen AI Security Project · 1 min read

OWASP LLM09:2026: embedding confidentiality and storage lifecycle

OWASP treats embeddings as sensitive data that still needs protection after ingestion. Its storage guidance calls for timely removal and reconciliation when source data is deleted, backups protected at the source data's sensitivity level, and encryption-key management separate from application access. Controlling retrieval permissions alone does not ensure that retained vectors or backups are deleted.

Open the reference Architecture GuideReviewed 2026-10-06

How to use this reference

Editorial review guidance: map source-to-embedding relationships, assign deletion deadlines and reconciliation evidence, and document backup sensitivity and encryption-key boundaries. Assess these storage obligations separately from permission-aware retrieval in an owned design.

Before reading

  • Basic concepts of embeddings, vector stores and retrieval-augmented generation
  • Data retention, backup classification and encryption-key management concepts

Context and limits

  • The edition README gives August 4, 2026 for release, while the official edition landing page displays August 3. Neither establishes the individual entry's original publication or latest update.
  • This scoped resource addresses retained derived data and backups; the existing 2025 retrieval-permission resource remains a separate historical learning reference.
  • No individual entry byline was established; project attribution does not identify every contributor as an author.
  • This is architectural guidance, not evidence of a product incident, a universal reconstruction result, a legal requirement or an individual award. Embedding inversion is not presented as a new discovery.

Sources and provenance

  1. LLM09:2026 Vector and Embedding Weaknesses: Storage Lifecycle Controls OWASP Gen AI Security Project · reviewed 2026-10-06
  2. OWASP Top 10 for LLM Applications 2026: published release overview OWASP Gen AI Security Project · reviewed 2026-10-06
  3. OWASP GenAI LLM Top 10 2026: edition landing page OWASP Gen AI Security Project · reviewed 2026-10-06

Record reviewed 2026-10-06. Snapshot cb017eaea66e. Open the complete JSON contract.

GitHub snapshot 2026-10-12

cb017eaea66e · JSON exports & schemas · CC BY 4.0 content / MIT software