CVE-2026-44217CWE-93

sse-channel: SSE Injection via unsanitized event fields

Medium · published May 12, 2026

CVSS v4.0
6.6
EPSS
1%
Percentile
44.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.6 · MEDIUM
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
EPSS
0.00538 · 44.5th percentile
Weakness
CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')
Published
2026-05-12T19:51Z
EPSS history
Timeline
  • 12 MAY 19:51Z
    sse-channel: SSE Injection via unsanitized event fields
    cvelistv5