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High, CVSS 7.4amended

@nestjs/platform-fastify: Path-scoped middleware bypass via absolute-form request targets

GHSA-9c5c-9qcx-q35q

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@nestjs/platform-fastify 12.0.2, 11.2.4), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

| Field | Value | | --- | --- | | Ecosystem | npm | | Package | @nestjs/platform-fastify | | Affected versions | = 12.0.0, < 12.0.2 and < 11.2.4 | | Patched versions | 12.0.2 and 11.2.4 (upgrade to 12.0.3 / 11.2.5) | Summary On the Fastify adapter, an HTTP request that uses an absolute-form request target (GET http://host/path HTTP/1.1 instead of GET /path HTTP/1.1) reaches the route handler without running the path-scoped Nest middleware bound to that route. Applications that enforce authentication or authorization in middleware execute the protected handler with those checks skipped. Impact Any application that - uses @nestjs/platform-fastify, and - binds middleware to specific paths via MiddlewareConsumer.forRoutes(...) or .exclude(...), and - is reachable by a client that controls the raw request line. Node's HTTP server accepts absolute-form targets, so no special server configuration is needed. Exposure is reduced when a reverse proxy in front of the application rewrites the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-9c5c-9qcx-q35q

  2. Revision 2 · amended ·

    Amended from osv record GHSA-9c5c-9qcx-q35q

  3. Revision 1 · created ·

    Published from ghsa record GHSA-9c5c-9qcx-q35q

Agent brief

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# Patch Next advisory brief: GHSA-9c5c-9qcx-q35q

Advisory: @nestjs/platform-fastify: Path-scoped middleware bypass via absolute-form request targets
IDs: GHSA-9c5c-9qcx-q35q
Record: https://patchnext.com/advisories/ghsa-9c5c-9qcx-q35q (revision 3, source checked 26 Oct 2026, 13:06 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @nestjs/platform-fastify 12.0.2, 11.2.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @nestjs/platform-fastify: affected < 11.2.4; >= 12.0.0, < 12.0.2; fixed in 11.2.4, 12.0.2

## Suggested inspection (read-only)
- `npm ls @nestjs/platform-fastify --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @nestjs/platform-fastify.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-9c5c-9qcx-q35q (GitHub-reviewed advisory GHSA-9c5c-9qcx-q35q lists affected ranges: npm @nestjs/platform-fastify >=0 =12.0.0 <12.0.2)
- Verified: https://osv.dev/vulnerability/GHSA-9c5c-9qcx-q35q (OSV record GHSA-9c5c-9qcx-q35q lists affected ranges: npm @nestjs/platform-fastify >=0 =12.0.0 <12.0.2 (fixed))

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