CVE-2026-33011 json
Nest Fastify HEAD Request Middleware Bypass
published 2026-03-17 7 mo ago modified 2026-06-17 4 mo ago also GHSA-wf42-42fg-fg84 , EUVD-2026-13549
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
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.
Patch / fix
- npm @nestjs/platform-fastify 11.1.16
- nestjs nest 11.1.16
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @nestjs/platform-fastify | <11.1.16 |
11.1.16 |
Affected products
- nestjs nest
Classification
- Weakness
-
- CWE-670 Always-Incorrect Control Flow Implementation
References
-
github.com
/nestjs/nest/commit/cbdf737cd6e7cefa52d05ecea2ae4af95c464614
web, patch
-
github.com
/nestjs/nest/security/advisories/GHSA-wf42-42fg-fg84
web, vendor-advisory
-
github.com
/nestjs/nest/releases/tag/v11.1.17
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-33011
advisory
-
github.com
/nestjs/nest
package
Sources
- CVE List CVE-2026-33011
- GitHub Advisory GHSA-wf42-42fg-fg84
- NVD CVE-2026-33011
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