🛡️ CVE-2026-35515
🟡 CVSS 6.1 — Medium ✅ No Known Exploit CWE-74 NVD
6.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity Medium
CVSS Score 6.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:L
CWE CWE-74
Public Exploit ✅ No
Source NVD
Published 2026-04-06
Updated 2026-06-02
Modified 2026-05-05
Fix URL N/A

Affected Packages

Software From version Fixed in
@nestjs/core — —
nest — 11.1.18

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