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    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.

    Published:May 26, 2026
    Last Modified:May 28, 2026
    EPS:May 26, 2026
    EPSS Score:0.0001
    CVSS Score:5.8

    Affected Products

    Vendor
    Rexxars
    Product
    Eventsource-encoder

    Exploits

    https://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpxhttps://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpx

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High