CVE-2026-44214— eventsource-encoder: SSE event injection via unsanitized event and id fields
Quick assessment
Affected
rexxars eventsource-encoder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
eventsource-encoder是Espen Hovlandsdal个人开发者的一个服务端事件编码工具。 eventsource-encoder 1.0.2之前版本存在注入漏洞，该漏洞源于序列化EventSourceMessage时未清理事件或ID字段，攻击者控制任一字段可注入任意服务器发送事件行终止符，从而伪造额外SSE字段或消息。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| rexxars | eventsource-encoder | < 1.0.2 |
affected |
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I. Basic Information for CVE-2026-44214
Vulnerability Information
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Vulnerability Title
eventsource-encoder: SSE event injection via unsanitized event and id fields
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
eventsource-encoder 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
eventsource-encoder是Espen Hovlandsdal个人开发者的一个服务端事件编码工具。 eventsource-encoder 1.0.2之前版本存在注入漏洞，该漏洞源于序列化EventSourceMessage时未清理事件或ID字段，攻击者控制任一字段可注入任意服务器发送事件行终止符，从而伪造额外SSE字段或消息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rexxars | eventsource-encoder | < 1.0.2 | - |
|
II. Public POCs for CVE-2026-44214
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44214 (1)
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V. Comments for CVE-2026-44214
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