CVE-2026-103100 in Infinity
Summary
by MITRE • 09/30/2026
Pexip Infinity before 40.1 is affected by improper input validation in the signaling implementation that allows a malicious attacker to trigger a software abort resulting in a denial of service.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified in Pexip Infinity versions prior to release 40.1 represents a critical flaw within the application's signaling subsystem, specifically stemming from insufficient validation of incoming data packets. As a unified communications platform designed for video conferencing and real-time collaboration, Pexip relies heavily on robust signal handling to manage session establishment, modification, and termination across distributed endpoints. The core technical deficiency lies in the failure to properly sanitize or validate specific inputs processed by the signaling engine before they are acted upon by lower-level system routines. This lack of rigorous boundary checking allows an attacker who can interact with the signaling interface to inject malformed data that violates expected logical constraints or memory layout assumptions inherent to the software architecture.
When a malicious actor exploits this improper input validation, the application is forced into an unrecoverable state characterized by a software abort. Unlike graceful error handling mechanisms which might log warnings and continue operation, a software abort typically results in the immediate termination of the affected process or service thread without cleanup procedures. In the context of Pexip Infinity, where high availability and continuous connectivity are paramount for enterprise communications, this abrupt cessation disrupts active sessions and prevents new connections from being established. The operational impact is effectively a denial of service condition, as legitimate users lose access to conferencing capabilities until the affected services are manually restarted or the system fails over to redundant nodes if such redundancy is configured but not impacted by the same vector.
From a classification perspective, this vulnerability aligns with CWE-20 Improper Input Validation and CWE-754: Improper Check for Unusual or Exceptional Conditions. The exploitation of this flaw does not require authentication in many deployment scenarios where signaling ports are exposed to untrusted networks, thereby increasing the risk profile significantly. In terms of offensive security frameworks, this behavior is consistent with ATT&CK technique T1499 Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion or service disruption through application layer attacks. The attacker leverages the signaling protocol's sensitivity to malformed packets to trigger a crash condition rather than attempting code execution, focusing purely on availability degradation.
Mitigation strategies must prioritize immediate patching as the primary defense vector. Organizations running Pexip Infinity versions earlier than 40.1 should upgrade to version 40.1 or later where these input validation checks have been strengthened and corrected by the vendor. In environments where immediate patching is not feasible due to operational constraints, network-level mitigations such as strict firewall rules restricting access to signaling ports from untrusted networks can provide a temporary buffer against exploitation. Additionally, implementing deep packet inspection solutions capable of identifying anomalous signaling traffic patterns may help detect attempted exploits before they trigger the abort condition. Continuous monitoring for service restarts or abnormal termination logs in system event viewers is also recommended to identify potential ongoing attack attempts and assess the scope of impact within the infrastructure.