What’s Vulnerable › Vulnerabilities

CVE-2026-44217: sse-channel: SSE Injection via unsanitized event fields

• Severity: medium (CVSS 6.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-93

Description

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

References

• https://github.com/rexxars/sse-channel/issues/42
• https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg

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