OpenAirInterface 2.2.1 Core Network conv::hex_str_to_uint8 resynchronizationInfo.rand/auts buffer overflow

Summaryinfo

A vulnerability was found in OpenAirInterface 2.2.1. It has been rated as very critical. Affected by this issue is the function conv::hex_str_to_uint8 of the component Core Network. The manipulation of the argument resynchronizationInfo.rand/auts leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-106808. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in OpenAirInterface 2.2.1. It has been rated as very critical. This issue affects the function conv::hex_str_to_uint8 of the component Core Network. The manipulation of the argument resynchronizationInfo.rand/auts with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-106808 since 10/07/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/02/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• OpenAirInterface

Version

• 2.2.1

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CPE 2.2info

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