{"id":"CVE-2026-40988","aliases":["GHSA-m69x-pw9p-7j3q"],"url":"https://o3.security/vulnerability/CVE-2026-40988","summary":"Unbounded DEFLATE Inflation in SAML 2.0 Service Provider","details":"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.\n\nAffected versions:\nSpring 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.","published":"2026-06-09T23:46:15.589Z","modified":"2026-08-12T15:56:00.742012286Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.springframework.security:spring-security-saml2-service-provider","fixedVersion":"7.0.6"},{"ecosystem":"Maven","name":"org.springframework.security:spring-security-saml2-service-provider","fixedVersion":"6.5.11"},{"ecosystem":"Maven","name":"org.springframework.security:spring-security-saml2-service-provider","fixedVersion":null},{"ecosystem":"Maven","name":"org.springframework.security:spring-security-saml2-service-provider","fixedVersion":null},{"ecosystem":"Maven","name":"org.springframework.security:spring-security-saml2-service-provider","fixedVersion":null},{"ecosystem":"Maven","name":"org.springframework.security:spring-security-saml2-service-provider","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://spring.io/security/cve-2026-40988"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40988.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40988"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T15:56:00.742012286Z"}}