{"id":"CVE-2026-35515","revision":"e5e57283368a438387244a4e320d58d8","records":[{"revision":"e5e57283368a438387244a4e320d58d8","observedAt":"2026-10-27T09:03:12.132+00:00","statement":{"source":"nvd","id":"CVE-2026-35515","aliases":[],"title":"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 c…","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.","state":0,"publishedAt":"2026-04-07T16:16:27.773+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:L","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/nestjs/nest/security/advisories/GHSA-36xv-jgw5-4q75"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-35515","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-74"],"productCriteria":["cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-04-07T16:16:27.773","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-35515","identifiers":["CVE-2026-35515"]},"retained":false,"historicalAffected":[]}],"coverage":[]}