CVE-2026-44214
Medium · 5.8CVSS
5.8
EPSS
0.3%
Published
May 26, 2026
CISA due date
—
The record
eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject arbitrary Server-Sent Events line terminators (\n, \r, or \r\n) and thereby forge additional SSE fields or entire messages on the stream. This vulnerability is fixed in 1.0.2.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | eventsource-encoder | 0 | 1.0.2 |
Related vulnerabilities
- GHSA-m9g3-3g99-mhpx eventsource-encoder vulnerable to SSE event injection via unsanitized `event` and `id`… Same vulnerability
- CVE-2026-114720 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an IMAP command… CWE-93
- CVE-2026-55467 OpenPrinting CUPS is an open source printing system for Linux and other Unix-like… CWE-93
- CVE-2026-102938 virtualenv is a tool for creating isolated virtual python environments. CWE-93
- CVE-2026-86813 The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters… CWE-93
- CVE-2026-19862 The JetFormBuilder WordPress plugin before 3.6.5.2 does not validate or strip line breaks… CWE-93
- CVE-2026-48019 Laravel is a web application framework. CWE-93
- CVE-2026-75925 Improper neutralization of CRLF sequences in IXON VPN Client before version 1.4.7 allows… CWE-93