Medium 6.6Published May 12, 2026

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

Updated under an hour ago (Oct 28, 2026, 2:40 AM ET)

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It affects rexxars sse-channel. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for rexxars sse-channel

Exploited in the last 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.

CVSS: 6.6 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
Weakness (CWE): CWE-93
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

rexxars sse-channel rexxars:sse_channel (from the name)	before 4.0.1	CNA record

References

References

https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg	x-refsource-confirm
https://github.com/rexxars/sse-channel/issues/42	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.