CVE-2026-40988
HIGHUnbounded DEFLATE Inflation in SAML 2.0 Service Provider
Title source: cnaDescription
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.
References (1)
Core 1
Core References
Scores
CVSS v3
7.5
EPSS
0.0032
EPSS Percentile
23.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
Status
published
Products (7)
Spring/Spring Security
5.7.0 - 5.7.24
Spring/Spring Security
5.8.0 - 5.8.26
Spring/Spring Security
6.3.0 - 6.3.17
Spring/Spring Security
6.4.0 - 6.4.17
Spring/Spring Security
6.5.0 - 6.5.11
Spring/Spring Security
7.0.0 - 7.0.6
vmware/spring_security
5.7.0 - 5.7.24
Published
Jun 10, 2026
Tracked Since
Jun 10, 2026