CVE-2026-47861
Description
A flaw was found in Spring Integration. An unauthenticated remote attacker can exploit this by sending a specially crafted UDP packet to a Spring Integration UDP inbound adapter. This allows the attacker to cause the server to emit an outbound UDP datagram to any internal or external host and port of their choosing. This vulnerability could lead to information disclosure or enable attackers to bypass network restrictions.
Statement
This Important flaw in Spring Integration's UDP inbound adapter allows an unauthenticated remote attacker to redirect UDP datagrams. By sending a crafted packet, an attacker can force the server to send outbound UDP traffic to arbitrary internal or external hosts and ports. This could facilitate network reconnaissance, bypass network segmentation, or be leveraged in multi-stage attacks, making it a significant concern for exposed applications.
Mitigation
To mitigate this issue, restrict network access to applications utilizing the Spring Integration UDP inbound adapter to only trusted sources. If the UDP inbound adapter functionality is not required, disable it within the application configuration to prevent exploitation. Consult the Spring Integration documentation for specific configuration details on disabling or securing UDP inbound adapters. If the service is running, a restart may be required for the changes to take effect.
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 | 7.3 | N/A | 6.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Access Control
Technical Impact: Bypass Protection Mechanism
By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
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