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Connections received from the proxy port may not count towards total accepted connections, resulting in server crashes if the total number of connections exceeds available resources. This only applies to connections accepted from the proxy port, pending the proxy protocol header.

CVE-2026-1848 is a vulnerability identified in MongoDB Server versions 7.0, 8.0, and 8.2, related to improper resource allocation and lack of throttling on connections accepted via the proxy port. Specifically, connections received through the proxy port do not increment the total accepted connections count, which is intended to limit resource consumption. This oversight allows an attacker to open an excessive number of connections through the proxy port, bypassing connection limits and exhausting server resources such as memory and file descriptors. The result is a denial-of-service (DoS) condition where the MongoDB server crashes or becomes unresponsive due to resource exhaustion. The vulnerability is categorized under CWE-770, which involves allocation of resources without proper limits or throttling. The CVSS 4.0 score of 8.2 reflects a high severity, with an attack vector over the network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on availability (VA:H). The vulnerability does not affect confidentiality or integrity but severely impacts availability. No known exploits have been reported in the wild yet, but the potential for DoS attacks is significant. The vulnerability affects MongoDB servers that expose the proxy port, which is often used in load balancing or proxying scenarios. Since the proxy protocol header is pending when connections are accepted, the server fails to properly account for these connections in its resource management. This flaw can be exploited remotely without authentication, making it a critical concern for exposed MongoDB deployments. The lack of patch links suggests that a fix may still be pending or in development, emphasizing the need for immediate mitigation strategies.

Detailed information about CVE-2026-1848: CWE-770 Allocation of Resources Without Limits or Throttling in MongoDB Inc MongoDB Server affecting MongoDB Inc Mongo

CVE-2026-1848: CWE-770 Allocation of Resources Without Limits or Throttling in MongoDB Inc MongoDB Server - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-1848: CWE-770 Allocation of Resources Without Limits or Throttling in MongoDB Inc MongoDB Server

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