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9.8

Apache NiFi Registry SSE streams can become corrupted

published 28 days ago
Summary

The Apache NiFi Registry component that handles real‑time server‑sent events may mix up or lose data in the stream. This can affect applications that rely on accurate live updates. Apply the latest software update or patch to fix the issue.

What to do
  • Update cleanstart apache-nifi-registry to version 2.9.0-r6.
Affected software
Ecosystem VendorProductAffected versions
CleanStart cleanstart apache-nifi-registry < 2.9.0-r6
Fix: upgrade to 2.9.0-r6
Original advisory text
Spring MVC applications using the functional web framework are vulnerable to stream corruption when using Server-Sent Events (SSE)
Security vulnerability affects the apache-nifi-registry package. Spring MVC applications using the functional web framework are vulnerable to stream corruption when using Server-Sent Events (SSE).
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Timeline
Published8 Oct 2026
Updated8 Oct 2026
First seen8 Oct 2026
Sources
CLEANSTART-2026-SB20243 · OSV
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