CVE-2026-35515 — @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')
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 Serve…
Published: 2026-04-07 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7