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CVE-2026-7307

30
FAUCET Score

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.

First published: May 19, 2026Last modified: May 20, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 26.4, < 26.4.12CPE matchmatch criteria
cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.74%
Probability of exploitation in next 30 days
EPSS Percentile
50.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0074 is in the 27th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: org.keycloak:keycloak-saml-coreFixed in: 26.6.2
redhatvendor investigatingvia nvd_reference
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Build of KeycloakFixed in: rhbk/keycloak-rhel9

Vendor Advisories (2)

mavenGHSA-p5mv-gj8j-xqgfhigh

Keycloak: Denial of Service via specially crafted SAML input

May 19, 2026
redhatCVE-2026-7307Important

keycloak: Keycloak: Denial of Service via specially crafted SAML input

May 19, 2026

References

security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-7307.json
access.redhat.com / errata/RHSA-2026:19594
Vendor Advisory
access.redhat.com / errata/RHSA-2026:19595
Vendor Advisory
access.redhat.com / errata/RHSA-2026:19596
Vendor Advisory
access.redhat.com / errata/RHSA-2026:19597
Vendor Advisory
access.redhat.com / security/cve/CVE-2026-7307
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Vendor Advisory