Vulnerability-Lookup

CVE-2026-35515 (GCVE-0-2026-35515)

Vulnerability from cvelistv5 – Published: 2026-04-07 15:06 – Updated: 2026-04-07 15:58

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.

Severity ?

6.3 (Medium)


                        
                          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

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Assigner

GitHub_M

References

URL

Tags

https://github.com/nestjs/nest/security/advisorie…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	nestjs	nest	Affected: < 11.1.18

Show details on NVD website

JSON

To clipboard

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GHSA-36XV-JGW5-4Q75

Vulnerability from github – Published: 2026-04-06 17:59 – Updated: 2026-04-07 22:09

Summary

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

Details

Impact

What kind of vulnerability is it? Who is impacted?

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. Spring Framework's own security patch (6e97587) validates these same fields (id, event) for the same reason.

Actual impact:

Event spoofing: Attacker forges SSE events with arbitrary event: types, causing client-side EventSource.addEventListener() callbacks to fire for wrong event types.
Data injection: Attacker injects arbitrary data: payloads, potentially triggering XSS if the client renders SSE data as HTML without sanitization.
Reconnection corruption: Attacker injects id: fields, corrupting the Last-Event-ID header on reconnection, causing the client to miss or replay events.
Attack precondition: Requires the developer to map user-influenced data to the type or id fields of SSE messages. Direct HTTP request input does not reach these fields without developer code bridging the gap.

Patches

Has the problem been patched? What versions should users upgrade to?

Patched in @nestjs/core@11.1.18

Severity ?

6.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.1.17"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@nestjs/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.1.18"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35515"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-74"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-06T17:59:51Z",
    "nvd_published_at": "2026-04-07T16:16:27Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\n[`SseStream._transform()`](https://github.com/nestjs/nest/blob/dea5279ef8fcb568de158003e4281759a2cd7675/packages/core/router/sse-stream.ts) 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. Spring Framework\u0027s own security patch ([6e97587](https://github.com/spring-projects/spring-framework/commit/6e9758700a4946be1dca85ca937ef2603e291301)) validates these same fields (`id`, `event`) for the same reason.\n\nActual impact:\n\n- **Event spoofing**: Attacker forges SSE events with arbitrary `event:` types, causing client-side `EventSource.addEventListener()` callbacks to fire for wrong event types.\n- **Data injection**: Attacker injects arbitrary `data:` payloads, potentially triggering XSS if the client renders SSE data as HTML without sanitization.\n- **Reconnection corruption**: Attacker injects `id:` fields, corrupting the `Last-Event-ID` header on reconnection, causing the client to miss or replay events.\n- **Attack precondition**: Requires the developer to map user-influenced data to the `type` or `id` fields of SSE messages. Direct HTTP request input does not reach these fields without developer code bridging the gap.\n-\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nPatched in `@nestjs/core@11.1.18`",
  "id": "GHSA-36xv-jgw5-4q75",
  "modified": "2026-04-07T22:09:36Z",
  "published": "2026-04-06T17:59:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35515"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/pull/16686"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/commit/83558ae774a990a7916141d3abe0b6548ff3a8b2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nestjs/nest"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/releases/tag/v11.1.18"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027)"
}

FKIE_CVE-2026-35515

Vulnerability from fkie_nvd - Published: 2026-04-07 16:16 - Updated: 2026-04-17 20:36

Severity ?

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75	Vendor Advisory

Impacted products

	Vendor	Product	Version
	nestjs	nest	*

JSON

To clipboard

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    }
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-35515 (GCVE-0-2026-35515)

GHSA-36XV-JGW5-4Q75

Impact

Attack precondition: Requires the developer to map user-influenced data to the type or id fields of SSE messages. Direct HTTP request input does not reach these fields without developer code bridging the gap.

Patches

FKIE_CVE-2026-35515

Tags

Sightings

Nomenclature

Attack precondition: Requires the developer to map user-influenced data to the `type` or `id` fields of SSE messages. Direct HTTP request input does not reach these fields without developer code bridging the gap.