How severe is CVE-2026-44217?

CVE-2026-44217 has a CVSS 4.0 base score of 6.6, rated medium severity.

Is CVE-2026-44217 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44217?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44217 have an EU (EUVD) identifier?

Yes. CVE-2026-44217 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29794.

When was CVE-2026-44217 published?

CVE-2026-44217 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-44217

CVE-2026-44217 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-93.

Key facts

Severity: Medium (CVSS 4.0 base score 6.6)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29794
Weakness: CWE-93
Published: 2026-05-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44217?: 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.
How severe is CVE-2026-44217?: CVE-2026-44217 has a CVSS 4.0 base score of 6.6, rated medium severity.
Is CVE-2026-44217 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44217?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44217 have an EU (EUVD) identifier?: Yes. CVE-2026-44217 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29794.
When was CVE-2026-44217 published?: CVE-2026-44217 was published on 2026-05-12 and last updated on 2026-06-17.

References

Other CWE-93 (CRLF Injection) vulnerabilities

CVE-2024-51501 — Critical (CVSS 10.0): Refit is an automatic type-safe REST library for .NET Core, Xamarin and .NET The various header-related Refit…
CVE-2026-45372 — Critical (CVSS 9.9): cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's…
CVE-2026-11362 — Critical (CVSS 9.8): DataDog::DogStatsd versions through 0.07 for Perl allow metric injections from event tags. DataDog::DogStatsd does not…
CVE-2025-40671 — Critical (CVSS 9.3): SQL injection vulnerability in AES Multimedia's Gestnet v1.07. This vulnerability allows an attacker to retrieve,…
CVE-2026-11373 — Critical (CVSS 9.1): Net::Statsite::Client versions through 1.1.0 for Perl allow metric injections. Net::Statsite::Client is a client for…
CVE-2026-50638 — Critical (CVSS 9.1): Metrics::Any::Adapter::DogStatsd versions before 0.04 for Perl does not protect against metric injections. The statsd…

Browse all CWE-93 (CRLF Injection) vulnerabilities →