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CVE-2026-82965— Keycloak-services: keycloak-services: unauthenticated denial of service via saml soap endpoint unbounded xml 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 实现中发现了一个漏洞。SAML 工件解析（Artifact Resolution）和 ECP SOAP 端点未能正确限制传入 XML 请求的大小或复杂度。未经身份验证的远程攻击者可通过发送特制的、超大 XML 消息来利用该漏洞，导致服务器消耗过量内存，进而引发应用内存耗尽并崩溃，造成所有用户的服务拒绝（DoS）。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-82965

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: unauthenticated denial of service via saml soap endpoint unbounded xml parsing
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solution. The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remote attacker can exploit this by sending specially crafted, large XML messages that cause the server to consume excessive memory. This leads to the application running out of memory and crashing, resulting in 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 Subscribe
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 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-2026-82965

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III. Intelligence Information for CVE-2026-82965

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Other References for CVE-2026-82965 (2)

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-2026-121997 8.1 HIGH Gdb: gdbserver: heap buffer overflow in cmd_qtdpsrc via qtdpsrc declared/actual length mis
CVE-2026-114232 8.1 HIGH Keycloak-services: keycloak-services: uma protection api resourcetype field not validated
CVE-2026-112208 8.1 HIGH Keycloak-services: keycloak-services: account takeover via stale sso_auth note in organiza
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-2026-107123 7.5 HIGH Keycloak-services: keycloak-services: unauthenticated cpu denial of service via saml xml d
CVE-2026-103112 7.5 HIGH Keycloak-services: keycloak-services: account takeover via authentication race using reset
CVE-2026-107602 7.5 HIGH Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo
CVE-2026-110931 7.5 HIGH Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authori
CVE-2026-110932 7.5 HIGH Keycloak-services: keycloak-services: unauthenticated persistent disk exhaustion via theme
CVE-2026-92855 7.4 HIGH Keycloak-services: keycloak-services: saml broker accepts holder-of-key assertions without
CVE-2026-93998 7.4 HIGH Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to the configur
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