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Rebuff

Palo Alto Networks

Open Source

Prompt injection defense project archived in May 2025 and not recommended for new projects.

Curated by Tiberiu ArvaStale

Apache 2.0Version 0.1.11,522
DocsRepository

Strengths

  • Prompt-injection focus
  • Archived OSS reference point
  • Historically notable

Practitioner note

Most relevant as a lightweight prompt-injection defense layer in custom stacks, not as a broad end-to-end AI governance product.

Warning

Rebuff: Archived May 16, 2025. Do not recommend for new projects.

Where it sits in the stack

Listed under Guardrails & security in the Control plane layer.

  1. Build & orchestrate
  2. Control plane
  3. Use

Pairs with, from Palo Alto Networks

Governance posture

Reviewed 2026-05-26
N/AData residency

Archived OSS library; operator-controlled if used.

YesDeployment model

Archived (2025-05-16); self-hosted if used; not recommended for new deployments. (self-hosted)

Source
N/AAudit logging

Archived library; no infrastructure.

N/ASOC 2

Archived OSS library.

N/AISO 27001

Archived OSS library.

N/AISO 42001

Archived OSS library.

N/AEU AI Act

Archived prompt-injection defense library; not an active AI system. (role: not-applicable)

YesLicense risk

Apache-2.0 — permissive; archived (abandonment risk). (low)

Source

EU AI Act obligations

Risk tier: Not applicable · as of 2026-10-10

Source-backed information mapped from Rebuff's tracked risk tier — not legal advice. Obligations depend on how your organisation deploys the system; see the full obligation reference and timeline.

This record's EU AI Act risk tier is marked not applicable, so no tier-specific obligations attach. Deployers embedding it in an AI system in scope of the Act should assess that system's own tier.

Change history

Source-backed and auto-detected events for this tool, newest first.

  1. Auto-detected
    githubStars: 1516 → 1522

    From snapshot diff 2026-08-22 → 2026-09-13.

  2. Auto-detected
    githubStars: 1510 → 1516

    From snapshot diff 2026-07-17 → 2026-08-04.

  3. Auto-detected
    githubStars: 1498 → 1510

    From snapshot diff 2026-06-07 → 2026-07-17.

Explore the category

Compare this tool against the rest of its category and the cloud platform foundation layer.

AI Guardrails & Agent Security

Return to the category grid to compare governance posture across every tracked tool.

Platforms

Review Microsoft Foundry, Amazon Bedrock, and Gemini Enterprise Agent Platform as the foundation layer.

Weekly updates

Track releases, deprecations, license changes, and other market movements.