CVE-2026-49434
Description
A flaw was found in Apache ActiveMQ. An attacker with privileges to publish or modify entries in Lightweight Directory Access Protocol (LDAP) can exploit an improper input validation vulnerability. This allows the attacker to instantiate denied transports within the broker's Java Virtual Machine (JVM). Consequently, this can be used to fetch an attacker-controlled URL and launch an additional BrokerService within the same JVM, potentially leading to a denial of service or further system compromise.
Statement
Red Hat products ship Apache ActiveMQ Classic components as transitive dependencies. The vulnerability is in the LdapNetworkConnector feature specific to Classic ActiveMQ, which allows an attacker with LDAP write access to instantiate denied transports and spawn a rogue broker. This feature is not configured or used in any Red Hat product deployment. Red Hat AMQ Broker is based on Apache ActiveMQ Artemis, a separate codebase that does not include the LdapNetworkConnector.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.6 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | None |
| Integrity Impact | Low | N/A | High |
| Availability Impact | High | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability
Technical Impact: Execute Unauthorized Code or Commands; Read Application Data; Modify Application Data
An attacker could include input that changes the LDAP query which allows unintended commands or code to be executed, allows sensitive data to be read or modified or causes other unintended behavior.
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