CVE-2026-22735: Server Sent Event stream corruption

Severity: low (CVSS 2.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-19 · updated 2026-06-17
Weakness: CWE-667

Description

Spring MVC and WebFlux applications are vulnerable to stream corruption when using Server-Sent Events (SSE). This issue affects Spring Foundation: from 7.0.0 through 7.0.5, from 6.2.0 through 6.2.16, from 6.1.0 through 6.1.25, from 5.3.0 through 5.3.46.

Affected products

Spring Framework: before 5.3.47; from 6.1.0 before 6.1.26; from 6.2.0 before 6.2.17; from 7.0.0 before 7.0.6 — fixed in 5.3.47, 6.1.26, 6.2.17, 7.0.6
Maven Org.Springframework:Spring-Webflux: from 7.0.0-M1 before 7.0.6; from 6.2.0 before 6.2.17; from 6.0.0 through 6.1.21; from 5.3.0 through 5.3.39; 7.0.0, 7.0.0-M1, 7.0.0-M2, 7.0.0-M3, 7.0.0-M4, 7.0.0-M5 (+115) — fixed in 7.0.6, 6.2.17
Maven Org.Springframework:Spring-Webmvc: from 7.0.0-M1 before 7.0.6; from 6.2.0 before 6.2.17; from 6.0.0 through 6.1.21; from 5.3.0 through 5.3.39; 7.0.0, 7.0.0-M1, 7.0.0-M2, 7.0.0-M3, 7.0.0-M4, 7.0.0-M5 (+115) — fixed in 7.0.6, 6.2.17
Spring Framework: from 7.0.0 through 7.0.5; from 6.2.0 through 6.2.16; from 6.1.0 through 6.1.25; from 5.3.0 through 5.3.46

How to fix

Upgrade to a fixed version: Spring Framework 5.3.47, 6.1.26, 6.2.17, 7.0.6; Maven Org.Springframework:Spring-Webflux 7.0.6, 6.2.17; Maven Org.Springframework:Spring-Webmvc 7.0.6, 6.2.17. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-22735

Get alerted when CVE-2026-22735 or the next vulnerability affects your stack