CVE-2026-5774— Juju API Server Denial of Service and Authentication Replay via Unsynchronized Token Map
Quick assessment
Affected
Canonical Juju
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.
Juju是Canonical Juju开源的一个开源应用程序编排引擎。 Juju 4.0.5版本、3.6.20版本和2.9.56版本存在安全漏洞，该漏洞源于API服务器中userTokens映射的同步不当，可能导致经过身份验证的用户对服务器发起拒绝服务攻击或重复使用一次性放电令牌。
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5774
Vulnerability Information
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Vulnerability Title
Juju API Server Denial of Service and Authentication Replay via Unsynchronized Token Map
Source: CVE Program / CVE List V5
Vulnerability Description
Improper synchronization of the userTokens map in the API server in Canonical Juju 4.0.5, 3.6.20, and 2.9.56 may allow an authenticated user to possibly cause a denial of service on the server or possibly reuse a single-use discharge token.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Juju 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juju是Canonical Juju开源的一个开源应用程序编排引擎。 Juju 4.0.5版本、3.6.20版本和2.9.56版本存在安全漏洞，该漏洞源于API服务器中userTokens映射的同步不当，可能导致经过身份验证的用户对服务器发起拒绝服务攻击或重复使用一次性放电令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-5774
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Patches & Fixes for CVE-2026-5774 (2)
Vendor Advisories for CVE-2026-5774 (1)
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V. Comments for CVE-2026-5774
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