CVE-2026-47890 — spring-webflux
CRITICALCVE-2026-47890 is a critical-severity (CVSS 9.8) CWE-93 vulnerability in org.springframework:spring-webflux. A fix is available for org.springframework:spring-webflux — see the affected versions and patch details below.
Spring Framework Server Sent Event stream corruption while rendering fragments
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-47890.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-47890 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webmvc☕org.springframework:spring-webmvcReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
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
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.springframework:spring-webflux | ≥ 6.2.0 | No fix |
| ☕Maven | org.springframework:spring-webflux | ≥ 7.0.0&&< 7.0.9 | 7.0.9org.springframework:spring-webflux:7.0.9 |
| ☕Maven | org.springframework:spring-webmvc | ≥ 6.2.0 | No fix |
| ☕Maven | org.springframework:spring-webmvc | ≥ 7.0.0&&< 7.0.9 | 7.0.9org.springframework:spring-webmvc:7.0.9 |
Affected Products
spring frameworkvmwareDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.springframework:spring-webflux, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
No patched version of org.springframework:spring-webflux has shipped for CVE-2026-47890 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Stream corruption vulnerability in Spring Framework WebFlux and MVC when rendering Server-Sent Events (SSE) with view fragments allows remote unauthenticated attackers to disrupt stream integrity. Exploitation requires attacker control over streamed data, resulting in malformed SSE responses, application state…
Disable view fragment rendering within Server-Sent Event (SSE) endpoints and emit fully instantiated responses or standardized DTOs instead.Source: Red Hat security advisory for CVE-2026-47890 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2026-47890 in your dependencies?
Find it across Maven, including transitive dependencies.