---
title: "CVE-2026-47890: Spring Framework Server Sent Event stream corruption while rendering fragments"
url: https://erroneo.us/security/cve/CVE-2026-47890/
description: "CVE-2026-47890 (org.springframework:spring-webflux (Maven)): Spring MVC and WebFlux applications are vulnerable to stream corruption when using Server-Sent…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-27
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-47890"
kev: false
cvss: 9.8
epss: 0.00564
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 46: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 46% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.springframework:spring-webflux (Maven) >= 6.2.0, <= 6.2.19, no fixed version listed ; org.springframework:spring-webflux (Maven) >= 7.0.0, <= 7.0.8, fixed in 7.0.9 ; org.springframework:spring-webmvc (Maven) >= 6.2.0, <= 6.2.19, no fixed version listed ; org.springframework:spring-webmvc (Maven) >= 7.0.0, <= 7.0.8, fixed in 7.0.9 . Check your lockfile, including transitive dependencies.

## What it is

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

## Affected packages

- Maven `org.springframework:spring-webflux` >= 6.2.0, <= 6.2.19 → fixed: none listed
- Maven `org.springframework:spring-webflux` >= 7.0.0, <= 7.0.8 → fixed: 7.0.9
- Maven `org.springframework:spring-webmvc` >= 6.2.0, <= 6.2.19 → fixed: none listed
- Maven `org.springframework:spring-webmvc` >= 7.0.0, <= 7.0.8 → fixed: 7.0.9

## Affected products (CVE record)

- Spring Spring Framework: 7.0.0 <= 7.0.8, 6.2.0 <= 6.2.19

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.56% probability of exploitation activity in the next 30 days; percentile 46.

## Sources

- [GitHub Advisory GHSA-j9f9-w8pj-32f8](https://github.com/advisories/GHSA-j9f9-w8pj-32f8)
- [CVE.org record CVE-2026-47890](https://www.cve.org/CVERecord?id=CVE-2026-47890)
- [NVD entry CVE-2026-47890](https://nvd.nist.gov/vuln/detail/CVE-2026-47890)
- [spring.io](https://spring.io/security/cve-2026-47890)

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Source page: https://erroneo.us/security/cve/CVE-2026-47890/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt