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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
rexxars sse-channel affected
Version Status Constraints
< 4.0.1 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-84hm-wfh8-c5pg sse-channel: SSE Injection via unsanitized event fields
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rexxars/sse-channel/issues/42 cve-icon cve-icon
https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg cve-icon cve-icon
History

Tue, 12 May 2026 20:15:00 +0000

Type Values Removed Values Added
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.
Title sse-channel: SSE Injection via unsanitized event fields
Weaknesses CWE-93
References
Metrics cvssV4_0

{'score': 6.6, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-12T19:51:06.910Z

Reserved: 2026-05-05T15:13:47.572Z

Link: CVE-2026-44217

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-12T20:16:42.513

Modified: 2026-05-12T20:16:42.513

Link: CVE-2026-44217

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T21:45:05Z

Weaknesses