OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow vulnerability in the OAI CN5G UDM Nudm_UEAU Generate Authentication Data endpoint. The UDM passes attacker-controlled resynchronizationInfo.rand and auts values to conv::hex_str_to_uint8(), which converts arbitrary-length hex strings into fixed-size stack buffers without validating the destination size. An unauthenticated attacker with access to the SBI interface and a valid SUPI can submit an oversized value to overwrite adjacent stack memory, corrupt the stack canary, and terminate the UDM process.
History

Mon, 02 Nov 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 02 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-121
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Mon, 02 Nov 2026 18:00:00 +0000

Type Values Removed Values Added
Description OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow vulnerability in the OAI CN5G UDM Nudm_UEAU Generate Authentication Data endpoint. The UDM passes attacker-controlled resynchronizationInfo.rand and auts values to conv::hex_str_to_uint8(), which converts arbitrary-length hex strings into fixed-size stack buffers without validating the destination size. An unauthenticated attacker with access to the SBI interface and a valid SUPI can submit an oversized value to overwrite adjacent stack memory, corrupt the stack canary, and terminate the UDM process.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-11-02T00:00:00.000Z

Updated: 2026-11-02T19:05:07.660Z

Reserved: 2026-10-07T00:00:00.000Z

Link: CVE-2026-106808

cve-icon Vulnrichment

Updated: 2026-11-02T19:04:15.287Z

cve-icon NVD

Status : Deferred

Published: 2026-11-02T18:18:34.120

Modified: 2026-11-02T19:35:33.347

Link: CVE-2026-106808

cve-icon Redhat

No data.