Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-79651— Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
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.

Keycloak-services 组件的主题本地化端点存在缺陷，该组件是负责 Keycloak 中认证流程和主题管理的核心服务。该问题产生的原因是，系统会接受来自未认证请求的任意语言环境标签（locale tags），并将其无限制地存入永久的内存缓存中。攻击者可以通过发送大量唯一语言环境标签，最终导致服务器内存耗尽并崩溃。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1027 · Obfuscated Files or Information
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-79651

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak. The issue occurs because the system accepts arbitrary locale tags from unauthenticated requests and stores them in a permanent in-memory cache without limits. An attacker can exploit this by sending a large number of unique locale tags, eventually causing the server to run out of memory and crash.
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 26.4 26.4-26 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-26 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.16-2 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.16 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.16 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.16 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-79651

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-79651

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-79651 (1)

Other References for CVE-2026-79651 (5)

Same Patch Batch · Red Hat · 2026-09-16 · 9 CVEs total

CVE-2026-74909 8.1 HIGH Keycloak-services: keycloak-services: incomplete fix for cve-2026-15573 allows policy enfo
CVE-2026-18212 7.5 HIGH Keycloak-services: keycloak-services: saml redirect deflate helpers leak native zlib state
CVE-2026-42784 7.4 HIGH Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusio
CVE-2026-17526 7.2 HIGH Keycloak-services: keycloak-services: privilege escalation via impersonation role allows t
CVE-2026-92615 6.6 MEDIUM Flightctl: flightctl: package-global go-git https transport mutated per-repo -- cross-tena
CVE-2026-92358 6.4 MEDIUM Keycloak-services: keycloak-services: residual cross-browser account-link proof allows sil
CVE-2026-92091 5.9 MEDIUM Jwcrypto: jwcrypto: denial of service via o(n^2) duplicate check on unbounded jwk key_ops
CVE-2026-19607 5.3 MEDIUM Keycloak-services: keycloak-services: broker-originated username collision causes account

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-400

V. Comments for CVE-2026-79651

No comments yet

Leave a comment