Medium severity6.1NVD Advisory· Published Apr 7, 2026· Updated Apr 17, 2026
CVE-2026-35515
CVE-2026-35515
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@nestjs/corenpm | < 11.1.18 | 11.1.18 |
Affected products
3- osv-coords2 versions
< 3.2.0-r5+ 1 more
- (no CPE)range: < 3.2.0-r5
- (no CPE)range: < 11.1.18
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-36xv-jgw5-4q75ghsaADVISORY
- github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-35515ghsaADVISORY
- github.com/nestjs/nest/commit/83558ae774a990a7916141d3abe0b6548ff3a8b2ghsaWEB
- github.com/nestjs/nest/pull/16686ghsaWEB
- github.com/nestjs/nest/releases/tag/v11.1.18ghsaWEB
News mentions
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