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CVE-2026-40988 — Vulnerability in...

HIGH

Spring Security SAML2 Service Provider: Unbounded writer inflates the compressed SAML payload into memory (DoS)

Published June 10, 2026Updated August 12, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published June 10, 2026 (124 days ago).
  • Last revised August 12, 2026 — 64 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.springframework.security:spring-security-saml2-service-provider to 7.0.6 or later
<!-- Update pom.xml dependency version to 7.0.6 for org.springframework.security:spring-security-saml2-service-provider -->
Maven
Update org.springframework.security:spring-security-saml2-service-provider to 6.5.11 or later
<!-- Update pom.xml dependency version to 6.5.11 for org.springframework.security:spring-security-saml2-service-provider -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (6)

Affects 1 ecosystem: maven (1).

PackageEcosystemAffectedFixed In
org.springframework.security:spring-security-saml2-service-provider
maven
6.4.0, 6.4.1, 6.4.10, 6.4.11 (+10 more)Range-based data available
org.springframework.security:spring-security-saml2-service-provider
maven
5.2.0.RELEASE, 5.2.1.RELEASE, 5.2.10.RELEASE, 5.2.11.RELEASE (+75 more)Range-based data available
org.springframework.security:spring-security-saml2-service-provider
maven
5.8.0, 5.8.1, 5.8.10, 5.8.11 (+13 more)Range-based data available
org.springframework.security:spring-security-saml2-service-provider
maven
7.0.0, 7.0.1, 7.0.2, 7.0.3 (+2 more)7.0.6
org.springframework.security:spring-security-saml2-service-provider
maven
6.3.0, 6.3.1, 6.3.10, 6.3.2 (+7 more)Range-based data available
org.springframework.security:spring-security-saml2-service-provider
maven
6.5.0, 6.5.1, 6.5.10, 6.5.2 (+7 more)6.5.11

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-400
    Uncontrolled Resource ConsumptionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2026-40988?
Spring Security SAML2 Service Provider: Unbounded writer inflates the compressed SAML payload into memory (DoS) This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-40988?
CVE-2026-40988 affects org.springframework.security:spring-security-saml2-service-provider. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-40988 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-m69x-pw9p-7j3q

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