CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCVE-2026-44214
Medium (5.3) in rexxars eventsource-encoder. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in eventsource-encoder 1.0.2.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-93, CWE-113
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rexxars:eventsource-encoder
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-m9g3-3g99-mhpx | npm | eventsource-encoder | <1.0.2 | 1.0.2 |