GHSA-j9f9-w8pj-32f8: org.springframework:spring-webflux (CVE-2026-47890)

Spring Framework Server Sent Event stream corruption while rendering fragments

CVSS 9.8 CriticalCriticalEPSS 0.0056 · 47th percentile

Critical, because:

CVSS score 9.8: 9.0 or more.

Published by the GitHub Advisory Database at 27 Aug 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
org.springframework:spring-webflux	Maven	>=6.2.0, <=6.2.19 \|\| >=7.0.0, <7.0.9	7.0.9
org.springframework:spring-webmvc	Maven	>=6.2.0, <=6.2.19 \|\| >=7.0.0, <7.0.9	7.0.9

Identifiers

GHSA-j9f9-w8pj-32f8 · CVE-2026-47890

Weakness (CWE)

CWE-93

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

spring-webflux and spring-webmvc are affected in versions 6.2.0 through 6.2.19 and 7.0.0 through 7.0.8, where Server-Sent Events streams can be corrupted when rendering view fragments. The source gives few details on what an attacker needs or can do. Upgrade to 7.0.9; no fixed version on the 6.2 line is listed.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub Advisory Database

CISA KEV Not listed.
EPSS 0.0056, the 47th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:16 UTC First seen by agentprime
31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.