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CVE-2026-111821— Apache ActiveMQ, Apache ActiveMQ KahaDB: Oversized client identifier strings poison the KahaDB journal

Quick assessment

Affected
Apache Software Foundation Apache ActiveMQ
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.

Apache ActiveMQ 和 Apache ActiveMQ KahaDB 中存在输入验证不当的漏洞。 在使用 KahaDB 的消息代理（broker）上，攻击者可创建一个持久订阅，其客户端 ID（clientId）与订阅名称（subscription name）的组合长度超过 65,535 字节（尽管两者单独长度均小于该限制），从而导致代理进程关闭且无法恢复。 受影响的版本范围如下： Apache ActiveMQ：6.0.0 至 6.3.2（不含 6.3.3），以及 5.19.11 及更早版本（不含 5.

AI Predicted 8.1 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-111821

Vulnerability Information
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Vulnerability Title
Apache ActiveMQ, Apache ActiveMQ KahaDB: Oversized client identifier strings poison the KahaDB journal
Source: CVE Program / CVE List V5
Vulnerability Description
Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB. A user can create a durable subscription with a clientId and subscription name that have a combined length > 65,535 (while separately being shorter) on a broker using KahaDB which can cause the broker to shutdown and be unrecoverable.  This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; Apache ActiveMQ KahaDB: from 6.0.0 before 6.3.3, before 5.19.12. Users are recommended to upgrade to version 6.4.0, 6.3.3 or 5.19.12, which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache ActiveMQ 6.0.0 ~ 6.3.3 -
Apache Software Foundation Apache ActiveMQ KahaDB 6.0.0 ~ 6.3.3 -

II. Public POCs for CVE-2026-111821

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III. Intelligence Information for CVE-2026-111821

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Other References for CVE-2026-111821 (1)

Same Patch Batch · Apache Software Foundation · 2026-11-04 · 23 CVEs total

CVE-2026-100300 8.7 HIGH Apache ZooKeeper: Unauthenticated persistent denial of service via unvalidated quota-node
CVE-2026-115448 8.7 HIGH Apache ZooKeeper: Unbounded recursion in snapshot serialization allows a client to render
CVE-2026-100252 8.6 HIGH Apache ZooKeeper: SASL authorization bypass on the client port through a client-supplied a
CVE-2026-100302 7.1 HIGH Apache ZooKeeper: Denial of service through unbounded memory allocation in multiRead reque
CVE-2026-100235 6.0 MEDIUM Apache ZooKeeper: ACL enforcement bypass allows unauthorized operations to commit after an
CVE-2026-59267 5.8 MEDIUM Apache OpenOffice: Heap Buffer Overflow in DXF LWPOLYLINE import could cause memory corrup
CVE-2026-59263 1.9 LOW Apache OpenOffice: Carefully crafted documents could display different data when opened wi
CVE-2026-59264 Apache OpenOffice: Uncontrolled search path element vulnerability in Windows installer
CVE-2026-90632 Apache OpenOffice: Local file inclusion via GStreamer plugin
CVE-2026-90634 Apache OpenOffice: Out-of-bounds write when importing encrypted PDF files
CVE-2026-90631 Apache OpenOffice: Remote document loaded without prompt, possibiy leaking environment var
CVE-2026-90629 Apache OpenOffice: Out of bounds memory access during WMF import
CVE-2026-90628 Apache OpenOffice: Stack overflow in CFF hint handling
CVE-2026-90627 Apache OpenOffice: Local file inclusion via SQL provider and flat file database references
CVE-2026-90626 Apache OpenOffice: Out-of-bounds write when importing encrypted PDF files
CVE-2026-90624 Apache OpenOffice: PDF File Parsing Heap based Buffer-Overflow-Remote Code Execution Vulne
CVE-2026-59268 Apache OpenOffice: Heap out-of-bounds write in WW8 PLCF reader
CVE-2026-108949 Apache ActiveMQ, ActiveMQ Broker: Repeated rejected temporary destination consumer request
CVE-2026-108500 Apache ActiveMQ: LDAPAuthorizationMap allows authorization bypass via DN injection
CVE-2026-103582 Apache ActiveMQ NMS OpenWire Client Library: Unbounded/Unvalidated Length Fields in Apache

Showing top 20 of 23 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache ActiveMQ
Same vendor: Apache Software Foundation
Same weakness: CWE-20