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open5gs

A weakness has been identified in Open5GS up to 2.7.6. This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve this issue. The issue report is flagged as already-fixed.

Open5GS is an open-source implementation of the 5G core network, widely used for research, testing, and some production environments. CVE-2026-1522 affects the SGWC (Serving Gateway Control) component, specifically the function sgwc_s5c_handle_modify_bearer_response located in src/sgwc/s5c-handler.c. This function handles modify bearer response messages on the S5 interface, which is critical for managing bearer sessions in the 5G core. The vulnerability arises from improper handling of these messages, allowing a remote attacker to craft malicious packets that cause the SGWC process to crash or become unresponsive, resulting in denial of service. The attack vector is network-based with no authentication or user interaction required, making it relatively easy to exploit. The vulnerability affects all Open5GS versions from 2.7.0 through 2.7.6. The issue has been publicly disclosed with a CVSS v4.0 score of 6.9 (medium severity), reflecting the moderate impact and ease of exploitation. A patch (commit b19cf6a) has been released to fix the flaw by improving input validation and error handling in the affected function. No known active exploitation campaigns have been reported, but the availability of a public exploit increases the risk of opportunistic attacks.

Detailed information about CVE-2026-1522: Denial of Service in Open5GS affecting null Open5GS. Get real-time updates, technical details, and mitigation strategi

CVE-2026-1522: Denial of Service in Open5GS - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-1522: Denial of Service in Open5GS

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