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CVE-2026-44217

sse-channel: SSE Injection via unsanitized event fields

MEDIUM
6.6
CVSS Score
Published: May 12, 2026 at 07:51 PM UTC
Updated: October 26, 2026 at 06:10 PM UTC
1 product affected across 1 vendorSse Channel

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Severity
MEDIUM6.6
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Sse Channel· Rexxars
90%
v < 4.0.1
Affected range stops below 4.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_CONFIRM
Source: cverecord
https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg
x_refsource_MISC
Source: cverecord
https://github.com/rexxars/sse-channel/issues/42

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.6MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-93

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