Medium
@nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-35515
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 01:22 UTC · Revision 1
Source evidence
@nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')
core-osv · Original sourcePublished 7 Apr 2026, 15:06 UTC
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.
osv:CVE-2026-35515
Complete source record
{
"id": "9b619e603d94a05493529510ecf1281a0b613c6143492a44f0066acf21038c8a",
"url": "https://osv.dev/vulnerability/CVE-2026-35515",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "@nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')",
"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.",
"evidence": "osv:CVE-2026-35515",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-35515",
"aliases": [
"CVE-2026-35515",
"GHSA-36xv-jgw5-4q75"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nestjs/nest",
"type": "GIT",
"events": [
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{
"fixed": "3c1cc5f91e95fcec27c3694cd42a08a50e85cc5f"
}
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"database_specific": {
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{
"fixed": "11.1.18"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"cpe": "cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:*",
"range": [
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{
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}
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],
"modified": "2026-10-28T02:30:41.548228297Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35515.json",
"https://github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75",
"https://nvd.nist.gov/vuln/detail/CVE-2026-35515"
],
"provider_metadata": {
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"cna_assigner": "GitHub_M",
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},
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"evidence": "/id"
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},
"source_id": "core-osv",
"document_id": 509020,
"published_at": "2026-04-07T15:06:10.619+00:00"
}