CVE-2026-22735: Spring MVC and WebFlux has Server Sent Event stream corruption

March 20, 2026

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.

References

github.com/advisories/GHSA-6hcq-hmm3-jj3c
github.com/spring-projects/spring-framework
nvd.nist.gov/vuln/detail/CVE-2026-22735
spring.io/security/cve-2026-22735

Code Behaviors & Features

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