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critical vulnerability

Spring Framework Server Sent Event stream corruption while rendering fragments

Partly patchedCritical · CVSS 9.8EPSS 0.56%

Published Aug 27, 2026 · updated Oct 7, 2026

What to do

  1. Upgrade to a fixed version: org.springframework:spring-webflux 7.0.9, org.springframework:spring-webmvc 7.0.9.
  2. Some affected packages have no fixed version yet: follow the advisory for mitigations and watch this page for the fix.
  3. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

Mavenorg.springframework:spring-webflux

Vulnerable versions
>= 6.2.0, <= 6.2.19
Fixed in
no fix yet

Check your project: mvn dependency:tree -Dincludes=org.springframework:spring-webflux

Mavenorg.springframework:spring-webflux

Vulnerable versions
>= 7.0.0, <= 7.0.8
Fixed in
7.0.9

Check your project: mvn dependency:tree -Dincludes=org.springframework:spring-webflux

Mavenorg.springframework:spring-webmvc

Vulnerable versions
>= 6.2.0, <= 6.2.19
Fixed in
no fix yet

Check your project: mvn dependency:tree -Dincludes=org.springframework:spring-webmvc

Mavenorg.springframework:spring-webmvc

Vulnerable versions
>= 7.0.0, <= 7.0.8
Fixed in
7.0.9

Check your project: mvn dependency:tree -Dincludes=org.springframework:spring-webmvc

Sources

CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

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