CVE-2026-35515
MEDIUM EPSS 14.2%
Published Apr 7, 20262mo ago · Modified Jun 17, 20262w ago
6.3 CVSS 4.0
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/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 Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
14.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-74
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| nestjs | nest | * | <11.1.18 |
References 1
- github.com https://github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.