CVE-2026-40988
Unbounded DEFLATE Inflation in SAML 2.0 Service Provider
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | spring |
| Product | spring security |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Jun 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Spring / Spring Security
5.7.0 < 5.7.24 5.8.0 < 5.8.26 6.3.0 < 6.3.17 6.4.0 < 6.4.17 6.5.0 < 6.5.11 7.0.0 < 7.0.6