CVE-2026-41840

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-09 · updated 2026-07-23
Weakness: CWE-401

Description

Spring WebFlux applications are vulnerable to Denial of Service (DoS) attacks when processing multipart requests. Affected versions: Spring Framework 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, 5.3.0 through 5.3.48.

Affected products

Spring Framework: from 5.3.0 before 5.3.49; from 6.1.0 before 6.1.28; from 6.2.0 before 6.2.18.1; from 7.0.0 before 7.0.7.1 — fixed in 5.3.49, 6.1.28, 6.2.18.1, 7.0.7.1
Spring Framework: from 7.0.0 before 7.0.7.1; from 6.2.0 before 6.2.18.1; from 6.1.0 before 6.1.28; from 5.3.0 before 5.3.49 — fixed in 7.0.7.1, 6.2.18.1, 6.1.28, 5.3.49

How to fix

Upgrade to a fixed version: Spring Framework 5.3.49, 6.1.28, 6.2.18.1, 7.0.7.1; Spring Framework 7.0.7.1, 6.2.18.1, 6.1.28, 5.3.49. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-41840

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