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CVE-2026-107123— Keycloak-services: keycloak-services: unauthenticated cpu denial of service via saml xml datetime and duration parsing

Quick assessment

Affected

Red Hat Red Hat Build of Keycloak

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在开源身份与访问管理解决方案 Keycloak 的 SAML XML 处理组件中发现了一个漏洞。当服务器解析包含过长 dateTime 或 duration 值的 XML 文档时，会触发该问题。由于这些字符串在处理前未得到适当验证，XML 解析器会消耗大量 CPU 时间。未认证的远程攻击者可通过向服务器发送精心构造的 SAML 请求利用此漏洞，导致 CPU 占用率飙升，进而对所有用户造成拒绝服务（DoS）。

CVSS 7.5 · High Updated Nov 06, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

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Vulnerability Information

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Vulnerability Title

Keycloak-services: keycloak-services: unauthenticated cpu denial of service via saml xml datetime and duration parsing

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the SAML XML processing component of Keycloak, an open-source identity and access management solution. The issue occurs when the server parses XML documents containing excessively long dateTime or duration values. Because these strings are not properly validated before processing, the XML parser consumes excessive CPU time. An unauthenticated remote attacker can exploit this by sending specially crafted SAML requests to the server, leading to high CPU utilization and a denial of service for all users.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Build of Keycloak	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Build of Keycloak	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Single Sign-On 7	-	`cpe:/a:redhat:red_hat_single_sign_on:7`

II. Public POCs for CVE-2026-107123

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-107123

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Other References for CVE-2026-107123 (2)

https://access.redhat.com/security/cve/CVE-2026-107123 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2547297 issue-tracking x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-107123

Same Patch Batch · Red Hat · 2026-11-05 · 24 CVEs total

CVE-2026-117691	9.1 CRITICAL	Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-e
CVE-2026-97175	8.8 HIGH	Keycloak-services: keycloak-services: unverified idp email auto-linking enables account ta
CVE-2026-121994	8.8 HIGH	Gdb: gdb: stack buffer overflow in fetch_register_using_p via unchecked p-reply length
CVE-2026-121996	8.2 HIGH	Gdb: gdbserver: heap disclosure and wild pointer in gdb_parse_agent_expr via untrusted age
CVE-2026-92857	8.1 HIGH	Keycloak-services: keycloak-services: dcr protocol mapper config not validated, allowing i
CVE-2026-112208	8.1 HIGH	Keycloak-services: keycloak-services: account takeover via stale sso_auth note in organiza
CVE-2026-114232	8.1 HIGH	Keycloak-services: keycloak-services: uma protection api resourcetype field not validated
CVE-2026-121997	8.1 HIGH	Gdb: gdbserver: heap buffer overflow in cmd_qtdpsrc via qtdpsrc declared/actual length mis
CVE-2026-96453	8.0 HIGH	Org.keycloak/keycloak-admin-cli: keycloak-admin-cli: kcadm custom truststore accepts arbit
CVE-2026-107912	7.7 HIGH	Io.quarkus/quarkus-vertx-http: quarkus-vertx-http: authorization bypass in management inte
CVE-2026-121995	7.5 HIGH	Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail
CVE-2026-82965	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated denial of service via saml soap endp
CVE-2026-110932	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated persistent disk exhaustion via theme
CVE-2026-110931	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authori
CVE-2026-107602	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo
CVE-2026-103112	7.5 HIGH	Keycloak-services: keycloak-services: account takeover via authentication race using reset
CVE-2026-93998	7.4 HIGH	Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to the configur
CVE-2026-92855	7.4 HIGH	Keycloak-services: keycloak-services: saml broker accepts holder-of-key assertions without
CVE-2026-97847	7.1 HIGH	Keycloak-services: keycloak-services: client manager can substitute sessionless token prin
CVE-2026-97174	6.8 MEDIUM	Keycloak-services: keycloak-services: ciba sub parameter injection causes attacker authent

Showing top 20 of 24 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak

Same vendor: Red Hat

Same weakness: CWE-400