CVE-2026-47890: Spring Framework Server Sent Event stream corruption while rendering fragments

CVE-2026-47890 · Severity: critical · CVSS 9.8 · Published 2026-08-27

Spring MVC and WebFlux applications are vulnerable to stream corruption when using Server-Sent Events (SSE) with view fragments. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19

Technologies: org.springframework:spring-webflux (Maven), org.springframework:spring-webmvc (Maven). Vendors: Maven.

Quick answers

Is CVE-2026-47890 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-47890 being exploited in the wild.
How severe is CVE-2026-47890?
Critical severity, with a CVSS score of 9.8, published 27 August 2026.
Which products and versions are affected?
org.springframework:spring-webflux (Maven) ECOSYSTEM:introduced=6.2.0,last_affected=6.2.19; org.springframework:spring-webmvc (Maven) ECOSYSTEM:introduced=6.2.0,last_affected=6.2.19.
Is there a fix for CVE-2026-47890?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-47890?
Check whether you run org.springframework:spring-webflux (Maven) or org.springframework:spring-webmvc (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • org.springframework:spring-webflux (Maven) ECOSYSTEM:introduced=6.2.0,last_affected=6.2.19
  • org.springframework:spring-webmvc (Maven) ECOSYSTEM:introduced=6.2.0,last_affected=6.2.19

Identifiers

  • CVE-2026-47890
  • GHSA-j9f9-w8pj-32f8

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.