CVE-2026-121512 in µD3TN
Summary
by MITRE • 11/03/2026
Memory Leak with Amplification in µD3TN BPv6 EID Reference Handling allows Unauthenticated Remote Attacker to Cause DoS
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified involves a critical memory leak and potential amplification issue within the Endpoint Identifier (EID) reference handling logic of the µD3TN protocol, specifically operating over IPv6. This flaw resides in the core processing mechanisms that manage how endpoint identifiers are referenced and maintained during communication sessions. As an unauthenticated remote attacker can exploit this condition without prior access or credentials, it represents a significant threat to the availability and integrity of systems implementing this protocol stack. The absence of authentication requirements lowers the barrier for entry, allowing any network actor with connectivity to trigger the vulnerability remotely.
At its technical core, the flaw stems from improper memory management practices during the lifecycle of EID references. When the system processes incoming packets or session requests involving endpoint identifiers, it allocates resources to track these references but fails to properly release them under specific conditions. This oversight leads to a progressive accumulation of unreleased memory allocations over time. In network protocols that handle high volumes of concurrent connections or rapid state transitions, such as those found in Delay-Tolerant Networking (DTN) extensions like µD3TN, this leak can accelerate rapidly. The amplification aspect suggests that the volume of leaked resources may scale disproportionately with the number of requests processed by an attacker, exacerbating the resource exhaustion effect beyond what would be expected from normal operational load.
The operational impact of this vulnerability is primarily centered on Denial of Service (DoS). As memory consumption increases due to the leak, the affected system will eventually exhaust its available heap or kernel memory space. This state leads to severe performance degradation as the operating system begins swapping memory to disk or struggling with allocation failures. Eventually, the application handling µD3TN communications may crash entirely, causing a complete loss of service for legitimate users relying on the protocol for data transmission. In critical infrastructure contexts where DTN protocols are used for robust communication in disrupted environments, such an outage could disrupt essential operations that depend on reliable message delivery and endpoint management.
From a classification perspective, this vulnerability aligns with CWE-401, which describes missing release of memory after effective usage, leading to resource exhaustion. Furthermore, the ability of an unauthenticated attacker to cause service disruption places it within the scope of ATT&CK technique T1498, specifically Network Denial of Service via amplification or reflection-like behaviors where a small input triggers disproportionate system impact. The lack of authentication also touches upon CWE-287 regarding improper authentication, although the primary damage vector here is resource exhaustion rather than unauthorized access to data.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Developers should audit the EID reference handling code paths to ensure that every memory allocation associated with endpoint identifiers has a corresponding deallocation routine executed under all exit conditions, including error states and session timeouts. Implementing strict limits on concurrent connections or request rates can help mitigate the amplification effect by capping the maximum rate at which resources are consumed. Additionally, deploying network-level monitoring tools to detect abnormal spikes in memory usage associated with µD3TN traffic can provide early warning signs of an active exploitation attempt. Updating to patched versions that address these specific memory management flaws is essential for restoring system stability and preventing further resource depletion attacks.