CVE-2026-35515 — @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')

CVE-2026-35515

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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
nestjs / nest	affected < 11.1.18

CWE

CWE-74

References

https://github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.