CVE-2026-44214
Last modified
CVE-2026-44214 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Rexxars | Eventsource-Encoder | < 1.0.2 |
References
- https://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpxExploit, Mitigation, Vendor Advisory
- https://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpxExploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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