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TI-2026-25458 Aliases CVE-2026-33011GHSA-wf42-42fg-fg84

Nest Fastify HEAD Request Middleware Bypass

Priority MEDIUM 44CWE-670Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Nest is a framework for building scalable Node.js server-side applications. In versions 11.1.15 and below, a NestJS application using @nestjs/platform-fastify GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist). As a result: middleware will be completely skipped, the HTTP response won't include a body (since the response is truncated when redirecting a HEAD request to a GET handler), and the actual handler will still be executed. This issue is fixed in version 11.1.16.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0036 29th percentileScored 2026-11-07
Fix Fixed nest (nestjs): 11.1.16@nestjs/platform-fastify (npm): 11.1.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nestjsnestbefore 11.1.1611.1.16Patch availableCNA
—@nestjs/platform-fastify (npm)before 11.1.1611.1.16Patch availableGHSA-wf42-42fg-fg84
  • nest Vendornestjs Affected before 11.1.16 Fixed in 11.1.16 Patch available CNA
  • @nestjs/platform-fastify (npm) Vendor— Affected before 11.1.16 Fixed in 11.1.16 Patch available GHSA-wf42-42fg-fg84

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:*before 11.1.16Vulnerablenestjs
  • cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:* Versions before 11.1.16 Vulnerable ·nestjs

Remediation

  • Fix · CNA nest (nestjs) Fixed in 11.1.16
  • Fix · GHSA-wf42-42fg-fg84 @nestjs/platform-fastify (npm) Fixed in 11.1.16 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33011
  2. 2026-10-03 Alias added: GHSA-wf42-42fg-fg84

References

Patch 1

Advisory 2

Other 2

  • TI-2026-01938 NestJS 11.1.13 - Lack of data validation allowing authentication/authorization bypass CVSS 4.0HIGH 8.2
  • TI-2025-42665 Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU) CVSS 4.0MEDIUM 6.9
  • TI-2024-19449 File Upload vulnerability in nestjs nest v.10.3.2 allows a remote attacker to execute… CVSS 3.1MEDIUM 5.5
  • TI-2026-29535 Nest: DoS via Recursive handleData in JsonSocket (TCP Transport) CVSS 3.1HIGH 7.5
  • TI-2026-27632 @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection') CVSS 4.0MEDIUM 6.3
  • TI-2023-11333 Information disclosure in @nestjs/core CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences