CVE-2026-2575Keycloak: keycloak: denial of service due to excessive samlrequest decompression
Updated under an hour ago ()
Does this affect you?
It affects Red Hat build of Keycloak 26.4 and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 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.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-409
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Keycloak 26.4 redhat:build_keycloak | from 26.4.10-1 not affected | CNA record |
Red Hat Red Hat Single Sign-On 7.6.13 redhat:red_hat_single_sign_on | 7.6 | CNA record |
Red Hat RHEL-8 based Middleware Containers redhat:rhosemc | from 7.6-85 not affected | CNA record |
redhat build_of_keycloak redhat:build_of_keycloak | from 26.4 before 26.4.10 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:3947vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3948vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76128vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76129vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76130vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76132vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76134vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-2575vdb-entry, x-refsource-redhat, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2440149issue-tracking, x-refsource-redhat, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.