Vulnerability in Nestjs Nest
CVE-2026-35515
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…
EPSS: 0.002 (14.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:L.
Affected products
- Nestjs Nest — versions < 11.1.18
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-35515?
- CVE-2026-35515 is a medium-severity vulnerability in Nestjs Nest, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2026-04-07.
- How severe is CVE-2026-35515?
- Medium severity. CVSS v3 base score is 6.1 out of 10.