CVE-2026-44217 MEDIUM

CVE-2026-44217: sse-channel: SSE Injection via unsanitized event fields

Vendor Rexxars
Product sse-channel
Weakness CWE-93 · CRLF injection
Published May 12, 2026
Last update May 14, 2026
View on NVD All CVEs

CVSS base score

6.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 14, 2026 Record updated