CVE-2026-59313: Server Sent Event stream corruption in Spring MVC functional web framework

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-27 · updated 2026-08-31
Weakness: CWE-93

Description

Spring MVC applications using the functional web framework are vulnerable to stream corruption when using Server-Sent Events (SSE). Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28 Spring Framework 6.0.0 - 6.0.30 Spring Framework 5.3.0 - 5.3.49

Affected products

Spring Framework: from 5.3.0 through 5.3.49; from 6.0.0 through 6.0.30; from 6.1.0 through 6.1.28; from 6.2.0 through 6.2.19; from 7.0.0 through 7.0.8
Spring Framework: from 7.0.0 through 7.0.8; from 6.2.0 through 6.2.19; from 6.1.0 through 6.1.28; from 6.0.0 through 6.0.30; from 5.3.0 through 5.3.49

References

https://spring.io/security/cve-2026-59313

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