CVE-2026-44217: Rexxars Sse-Channel

Medium severity, CVSS 6.6. EPSS: 0.5% chance of exploitation in the next 30 days.

sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject arbitrary messages into the stream. This vulnerability is fixed in 4.0.1.

Affected products

• Rexxars Sse-Channel: before 4.0.1 (fixed in 4.0.1)

Published 2026-05-12. Last modified 2026-06-17.