Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') Affecting @nestjs/core package, versions <11.1.18
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-NESTJSCORE-15920868
- published7 Apr 2026
- disclosed6 Apr 2026
- creditLê Minh Quân
Introduced: 6 Apr 2026
NewCVE-2026-35515 (opens in a new tab)How to fix?
Upgrade @nestjs/core to version 11.1.18 or higher.
Overview
@nestjs/core is a Nest - modern, fast, powerful node.js web framework (@core)
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') via the SseStream._transform function. An attacker can inject arbitrary Server-Sent Events, spoof event types, and corrupt reconnection state by supplying specially crafted newline characters in upstream data that is mapped to the type or id fields.
Note:
This is only exploitable if user-influenced data is mapped to these fields by developer code.