critical severityConfidence highHistorical record

Fastify middie absolute-form requests can skip auth

Direct answer

Fastify middie absolute-form requests can skip auth, also tracked as CVE-2026-85184 / @fastify/middie absolute-form bypass is a critical-severity threat campaign HOL Guard tracked from Sep 4, 2026 to Sep 4, 2026, verified against 3 primary sources and last reviewed Sep 20, 2026. Active tracking has ended and the record remains published as a permanent historical research record.

@fastify/middie before 9.3.4 allows absolute-form requests to skip path-scoped middleware auth. Upgrade to 9.3.4.

Also tracked as CVE-2026-85184 · @fastify/middie absolute-form bypass

First observed
Sep 4, 2026
Last observed
Sep 4, 2026
Last reviewed
Sep 20, 2026
Tracking ended
Sep 4, 2026

Record exports

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Uncertainty and limitations

Read the evidence limits before acting on this record.

Confirm whether your app uses path-scoped middie middleware.

  • Scoped to absolute-form request + path-scoped middie middleware.
  • Fixed version 9.3.4 from GHSA.
  • HOL blog is operator guidance.

Guard coverage and policy

What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.

No Guard coverage mapping or campaign-specific policy guidance is published for this record.

Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

Open policy controlsCampaign-specific emergency policy starting point

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Disclosure

    CVE-2026-85184 @fastify/middie absolute-form middleware bypass disclosed.

    Sources:GitHub Security Advisory GHSA-hx87-8wv7-pjv8·NVD CVE-2026-85184

  2. Update

    HOL Guard published operator coverage for CVE-2026-85184.

    Source:HOL Guard operator write-up

Publication clock: 403.6 hours from reviewed disclosure timestamp to HOL publication; 12-hour critical target; historical backfill outside target.

Reviewed artifacts

The specific artifacts this record concerns, as reviewed. Names and versions are shown as text; a registry link is not recorded here.

  • @fastify/middie@>=9.1.0 <9.3.4npmpackage

Sources

Every claim on this record is traceable to the sources below.

Campaign questions, answered

@fastify/middie before 4 allows absolute-form requests to skip path-scoped middleware auth. HOL Guard tracked the campaign from Sep 4, 2026 to Sep 4, 2026.

No. Active tracking ended Sep 4, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.

The record cites 3 primary sources, names 1 reviewed artifact, and was last fully reviewed Sep 20, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.

Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the record. Confirm whether your app uses path-scoped middie middleware.

Reviewed in full by HOL Guard Security Publishing.

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Record HGTC-2026-21EC3D3F