CVE-2026-40988 - Vulnerability Details - OpenCVE

An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Spring	Spring Security

No data.

No data.

References

Link	Providers
https://spring.io/security/cve-2026-40988

History

Wed, 10 Jun 2026 03:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Spring Spring spring Security
Vendors & Products		Spring Spring spring Security

Wed, 10 Jun 2026 00:00:00 +0000

Type	Values Removed	Values Added
Description		An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.
Title		Unbounded DEFLATE Inflation in SAML 2.0 Service Provider
Weaknesses		CWE-400
References		https://spring.io/security/cve-2026-40988
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

MITRE

Status: PUBLISHED

Assigner: vmware

Published: 2026-06-09T23:46:15.589Z

Updated: 2026-06-09T23:46:15.589Z

Reserved: 2026-04-16T02:19:09.389Z

Link: CVE-2026-40988

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-06-10T00:16:49.527

Modified: 2026-06-10T00:16:49.527

Link: CVE-2026-40988

Redhat

No data.

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