CVE-2026-44214
CVE-2026-44214 is a medium-severity vulnerability in Rexxars Eventsource-encoder with a CVSS 3.x base score of 5.8. 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 3.x base score 5.8)
- EPSS exploit prediction: 0% (20th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31968
- Weakness: CWE-93
- Affected product: Rexxars Eventsource-encoder
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-44214?
- 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.
- How severe is CVE-2026-44214?
- CVE-2026-44214 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2026-44214 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-44214?
- CVE-2026-44214 affects Rexxars Eventsource-encoder. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-44214?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-44214 have an EU (EUVD) identifier?
- Yes. CVE-2026-44214 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31968.
- When was CVE-2026-44214 published?
- CVE-2026-44214 was published on 2026-05-26 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:rexxars:eventsource-encoder:*:*:*:*:*:node.js:*:*
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