Spring Security SAML2 Service Provider: Unbounded writer inflates the compressed SAML payload into memory (DoS)
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-40988US | — | — | ||
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 wr… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/spring-projects/spring-securityPACKAGE
- https://github.com/spring-projects/spring-security/releases/tag/6.5.11WEB
- https://github.com/spring-projects/spring-security/releases/tag/7.0.6WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-40988ADVISORY
- https://spring.io/security/cve-2026-40988WEB
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