Medium severityGHSA Advisory· Published May 12, 2026· Updated May 13, 2026

CVE-2026-44217

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
sse-channelnpm	< 4.0.1	4.0.1

Affected products

Rexxars/Sse ChannelGHSA
Range: <= 4.0.0
ghsa-coords
pkg:npm/sse-channel
Range: < 4.0.1

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-84hm-wfh8-c5pgghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-44217ghsaADVISORY
github.com/rexxars/sse-channel/issues/42nvdWEB
github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pgnvdWEB

News mentions

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cvss	0.260
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000