{"id":"CVE-2026-2575","title":"A flaw was found in Keycloak","summary":"A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limi…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-409"],"vendor":"redhat","product":"build_of_keycloak","affected":["build_of_keycloak >= 26.4, < 26.4.10"],"patched":["build_of_keycloak 26.4.10"],"published":"2026-03-18","updated":"2026-10-06","sourceUpdated":"2026-10-06T18:16:54.180","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-2575","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:3947","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:3948","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76128","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76129","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76130","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76132","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76134","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-2575","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2440149","label":"secalert@redhat.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2575"},{"url":"https://github.com/keycloak/keycloak/issues/46372"},{"url":"https://github.com/keycloak/keycloak/commit/4f90ef67f698dfb45df0d2f4981271a7c8b47f04"},{"url":"https://github.com/advisories/GHSA-xv6h-r36f-3gp5"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2575.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-2575"}],"tags":["nvd","ghsa","maven","cve.org","csaf","vex","red-hat"],"aliases":["GHSA-xv6h-r36f-3gp5"],"ecosystem":"maven","epss":0.00648,"epssPercentile":0.50861,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-18T13:34:34.411686Z"},"ingestedAt":"2026-09-29T16:39:33.224Z","slug":"CVE-2026-2575","body":"## Overview\n\nA flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.\n\n## Affected\n\n- `build_of_keycloak >= 26.4, < 26.4.10`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `build_of_keycloak 26.4.10`\n\n## Package advisory (CVE-2026-2575)\n\nAffected packages:\n\n- `org.keycloak:keycloak-saml-adapter-core < 26.5.4`\n- `org.keycloak:keycloak-saml-core < 26.5.4`\n- `org.keycloak:keycloak-services < 26.5.4`\n\nPatched in:\n\n- `org.keycloak:keycloak-saml-adapter-core 26.5.4`\n- `org.keycloak:keycloak-saml-core 26.5.4`\n- `org.keycloak:keycloak-services 26.5.4`\n\nSource: https://github.com/advisories/GHSA-xv6h-r36f-3gp5\n\n## Vendor advisories\n\n- **RHSA-2026:76134** · Red Hat · fixed in: Middleware Containers for OpenShift · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:76134)\n- **RHSA-2026:3948** · Red Hat · fixed in: Red Hat build of Keycloak 26.4 · released 2026-03-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:3948)\n- **RHSA-2026:76132** · Red Hat · fixed in: Red Hat Single Sign-On 7.6.13 · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:76132)\n- **RHSA-2026:3947** · Red Hat · fixed in: Red Hat build of Keycloak 26.4.10 · released 2026-03-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:3947)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}