High severity · published May 19, 2026
CVE-2026-7307
Keycloak: keycloak: denial of service via specially crafted saml input
7.5
CVSS
0.9%
EPSS
No
On KEV
Description
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RB
RHEL-8 based Middleware Containers · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Single Sign-On 7.6 for RHEL 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Single Sign-On 7.6 for RHEL 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Single Sign-On 7.6 for RHEL 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat build of Keycloak 26.2 · Red Hat
All versions, or not specified · source: vendor, CISA
RH
Red Hat build of Keycloak 26.4 · Red Hat
All versions, or not specified · source: vendor, CISA
BO
Build OF Keycloak · Redhat
26.4 before 26.4.12 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7307
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-7307
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:19594
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:19595
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:19596
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:19597
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:76128
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:76129
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