CVE-2026-44214
eventsource-encoder: SSE event injection via unsanitized event and id fields
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 5.8EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
26 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Affected products
rexxars · eventsource-encoderWant to know if your infrastructure is exposed to this?
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