Staging Environment: Content and features may be unstable or change without notice.
Advisory details: vulnrichment / CVE-2026-7307
Advisory ID vulnrichment/CVE-2026-7307
Aliases
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-1286 Improper Validation of Syntactic Correctness of Input
System Score Found at
cvssv3.1 7.5
ssvc Track
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2026:76132
https://access.redhat.com/errata/RHSA-2026:76134
https://access.redhat.com/security/cve/CVE-2026-7307
https://bugzilla.redhat.com/show_bug.cgi?id=2476526
cpe:/a:redhat:build_keycloak:26.2::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.2::el9
cpe:/a:redhat:build_keycloak:26.4::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.4::el9
cpe:/a:redhat:red_hat_single_sign_on:7.6 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:red_hat_single_sign_on:7.6
cpe:/a:redhat:rhosemc:1.0::el8 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:rhosemc:1.0::el8
RHSA-2026:19594 Advisory https://access.redhat.com/errata/RHSA-2026:19594
RHSA-2026:19595 Advisory https://access.redhat.com/errata/RHSA-2026:19595
RHSA-2026:19596 Advisory https://access.redhat.com/errata/RHSA-2026:19596
RHSA-2026:19597 Advisory https://access.redhat.com/errata/RHSA-2026:19597
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at None
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-19T12:49:06Z/ Found at None

There are no SSVC decisions available.