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sse-channel

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 6.6npmAmendedPublished

    sse-channel: SSE Injection via unsanitized event fields

    CVE-2026-44217 · GHSA-84hm-wfh8-c5pg

    Affected
    • npm sse-channel <= 4.0.0
    Fixed in
    4.0.1· Vendor fix available
    Issue
    Impact Implementations that allows user-provided values to be passed to event, retry or id fields would be susceptible to event spoofing, where an attacker could inject arbitrary messages into the stream. - Event Spoofing: Attacker can inject arbitrary SSE events into the stream - Client-side Manipulation: Injected events can trigger unintended behavior in frontend JavaScript EventSource listeners - Data Integrity: Consumers of the SSE stream cannot distinguish injected events from legitimate ones Patches Patch available in v4.0.1. Workarounds Do not allow user data to control event, retry or id fields, and if you must - sanitize the input before passing it to sse-channel, stripping any newlines. Resources https://github.com/rexxars/sse-channel/issues/42

    Recommended action: Upgrade to 4.0.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:osv.dev (1)github.com (2)Source checked Evidence →