TI-2026-27632 Aliases CVE-2026-35515 GHSA-36xv-jgw5-4q75

@nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')

LOW 28CWE-74Published 2026-04-07 · Updated 2026-04-07

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: Partial Red Hat: 2 without a fix

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

Summary

Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.18, SseStream._transform() interpolates message.type and message.id directly into Server-Sent Events text protocol output without sanitizing newline characters (\r, \n). Since the SSE protocol treats both \r and \n as field delimiters and \n\n as event boundaries, an attacker who can influence these fields through upstream data sources can inject arbitrary SSE events, spoof event types, and corrupt reconnection state. This vulnerability is fixed in 11.1.18.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00243 15th percentileScored 2026-11-07

Fix Partial nest (nestjs): 11.1.18@nestjs/core (npm): 11.1.18Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nestjs	nest	before 11.1.18	11.1.18	Patch available	CNA
—	@nestjs/core (npm)	before 11.1.18	11.1.18	Patch available	GHSA-36xv-jgw5-4q75

nest Vendornestjs Affected before 11.1.18 Fixed in 11.1.18 Patch available CNA
@nestjs/core (npm) Vendor— Affected before 11.1.18 Fixed in 11.1.18 Patch available GHSA-36xv-jgw5-4q75

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nestjs:nest::::::node.js::*	before 11.1.18	Vulnerable	nestjs

cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:* Versions before 11.1.18 Vulnerable ·nestjs

Remediation

Fix · CNA nest (nestjs) Fixed in 11.1.18
Fix · GHSA-36xv-jgw5-4q75 @nestjs/core (npm) Fixed in 11.1.18 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Developer Hub 1	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-35515
2026-10-03 Alias added: GHSA-36xv-jgw5-4q75
2026-10-27 Affected versions changed · Red Hat

References

Advisory 2

Other 4

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-2026-25458 Nest Fastify HEAD Request Middleware Bypass CVSS 4.0HIGH 8.7
TI-2026-29535 Nest: DoS via Recursive handleData in JsonSocket (TCP Transport) CVSS 3.1HIGH 7.5
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