# CVE-2026-106808: OpenAirInterface Core Network stack buffer overflow in UDM authentication

Source: https://junglewise.ai/threats/cve-2026-106808-openairinterface-core-network-v2-2-1-has-a-stack-based-buffer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-106808 · Severity: info · Published 2026-11-02

OpenAirInterface Core Network is a 5G telecom infrastructure system that manages user authentication for mobile networks. A stack buffer overflow in the UDM (User Data Management) authentication endpoint allows an unauthenticated attacker to crash the service and potentially execute code by sending specially crafted authentication requests. This can disrupt mobile network operations and enable network compromise.

Vendors: [Openairinterface](https://junglewise.ai/threats/vendors/openairinterface).

## Quick answers

**Is CVE-2026-106808 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106808 being exploited in the wild.

**How severe is CVE-2026-106808?** Informational severity, published 2 November 2026.

**Which products and versions are affected?** Openairinterface Core Network (OAI CN5G UDM) v2.2.1.

**Is there a fix for CVE-2026-106808?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-106808 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-106808?** Check whether you run Openairinterface Core Network (OAI CN5G UDM) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the hex_str_to_uint8() function used by the Nudm_UEAU Generate Authentication Data endpoint. The function converts hex strings to fixed-size stack buffers without validating input length against destination capacity. An attacker with network access to the SBI interface and a valid SUPI can submit oversized resynchronizationInfo.rand or auts values to overflow fixed 16-byte buffers, corrupt the stack canary, and crash the UDM process; the overflow is fully attacker-controlled and potentially exploitable for code execution.

## Affected products

- OpenAirInterface Core Network (OAI CN5G UDM) v2.2.1

## Timeline

- 2026-11-02: disclosed

## References

- [https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116](https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116)
- [https://github.com/openairinterface/oai-cn5g-udm/issues/4](https://github.com/openairinterface/oai-cn5g-udm/issues/4)