# CVE-2026-106808: CVE-2026-106808

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- n/a / n/a: Version not specified (affected). Source: CNA: mitre

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-121

## Exploit evidence

- exploit: https://github.com/openairinterface/oai-cn5g-udm/issues/4 (ADP: CISA-ADP)

## References

- https://github.com/openairinterface/oai-cn5g-udm/issues/4 (CNA: mitre)

- https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116 (CNA: mitre)

- https://github.com/openairinterface/oai-cn5g-udm/issues/4 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: mitre: https://www.cve.org/CVERecord?id=CVE-2026-106808; retrieved 2026-11-02; source updated 2026-11-02

Revision: 636fe749aaa611b908317a5c90d0c98e53de523c80e0f7bf71fc2d10e87bb7f7

Canonical: https://y2.dev/cve/CVE-2026-106808

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