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Vulnerability Details :

CVE-2026-44217

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-12 May, 2026 | 19:51
Updated At-14 May, 2026 | 19:52
Rejected At-
Credits

sse-channel: SSE Injection via unsanitized event fields

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:12 May, 2026 | 19:51
Updated At:14 May, 2026 | 19:52
Rejected At:
▼CVE Numbering Authority (CNA)
sse-channel: SSE Injection via unsanitized event fields

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
Vendor
rexxars
Product
sse-channel
Versions
Affected
  • < 4.0.1
Problem Types
TypeCWE IDDescription
CWECWE-93CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Type: CWE
CWE ID: CWE-93
Description: CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Metrics
VersionBase scoreBase severityVector
4.06.6MEDIUM
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
Version: 4.0
Base score: 6.6
Base severity: MEDIUM
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
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
Hyperlink: https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/rexxars/sse-channel/issues/42
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:12 May, 2026 | 20:16
Updated At:13 May, 2026 | 18:21

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.6MEDIUM
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 6.6
Base severity: MEDIUM
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-93Primarysecurity-advisories@github.com
CWE ID: CWE-93
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/rexxars/sse-channel/issues/42security-advisories@github.com
N/A
https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pgsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/rexxars/sse-channel/issues/42
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/rexxars/sse-channel/security/advisories/GHSA-84hm-wfh8-c5pg
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

Similar CVEs

1Records found
CVE-2026-44214
Matching Score-6
Assigner-GitHub, Inc.
ShareView Details
Matching Score-6
Assigner-GitHub, Inc.
CVSS Score-5.8||MEDIUM
EPSS-0.01% / 1.54%
||
7 Day CHG~0.00%
Published-26 May, 2026 | 19:34
Updated-28 May, 2026 | 14:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
eventsource-encoder: SSE event injection via unsanitized event and id fields

eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject arbitrary Server-Sent Events line terminators (\n, \r, or \r\n) and thereby forge additional SSE fields or entire messages on the stream. This vulnerability is fixed in 1.0.2.

Action-Not Available
Vendor-rexxarsrexxars
Product-eventsource-encodereventsource-encoder
CWE ID-CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CWE ID-CWE-93
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Details not found