{"cve":"CVE-2026-44217","nvd":{"published":"2026-05-12T20:16:42.513","modified":"2026-10-26T18:10:00.173","status":"Deferred","description":"sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject arbitrary messages into the stream. This vulnerability is fixed in 4.0.1.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U","score":6.6},"cvss_v3":null,"cwes":["CWE-93"],"references":["https://github.com/rexxars/sse-channel/issues/42","https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg"],"products":[],"source":"nvd","synced_at":"2026-10-26T18:27:13.530666824+00:00"},"epss":{"cve":"CVE-2026-44217","score":0.00479,"percentile":0.41076,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-84hm-wfh8-c5pg","url":"https://osv.dev/vulnerability/GHSA-84hm-wfh8-c5pg","summary":"sse-channel: SSE Injection via unsanitized event fields","modified":"2026-05-13T16:46:23.718132Z","packages":[{"ecosystem":"npm","name":"sse-channel","purl":"pkg:npm/sse-channel","ranges":["<4.0.1"],"fixed":["4.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}