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CVE-2026-110931— Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authoritybinding parsing loop

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 Keycloak（一种用于身份和访问管理的工具）的 SAML 1.1 断言解析器中发现了一个缺陷。该问题出现在解析器处理认证声明中名为 AuthorityBinding 的特定元素时。由于此前某个漏洞的修复不完整，解析器可能陷入无限循环，耗尽所有可用内存，导致整个 Keycloak 服务崩溃，用户无法访问。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-110931

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authoritybinding parsing loop
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the SAML 1.1 assertion parser of Keycloak, a tool used for identity and access management. The issue occurs when the parser handles a specific element called AuthorityBinding within an authentication statement. Due to an incomplete fix for a previous vulnerability, the parser can enter an infinite loop that consumes all available memory, causing the entire Keycloak service to crash and become unavailable to 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
不可达退出条件的循环(无限循环)
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 Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-110931

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III. Intelligence Information for CVE-2026-110931

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Other References for CVE-2026-110931 (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-2026-112208 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-2026-107602 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-2026-107123 7.5 HIGH Keycloak-services: keycloak-services: unauthenticated cpu denial of service via saml xml d
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-835