CVE-2026-7781 — Open5GS Denial of Service
CVE-2026-7781 — A security vulnerability has been detected in Open5GS up to 2.7.7. Affected by this issue is the function udm_nudm_uecm_handle_amf_registration_update of the file /src/udm/nudm-handler.c of the component amf-3gpp-access Endpoint. The manipulation leads to denial of service. The attac
What This Means For You
- If your environment is affected by CWE-404, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-7781 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-7781 - Open5GS UDM AMF Registration Update DoS
title: CVE-2026-7781 - Open5GS UDM AMF Registration Update DoS
id: scw-2026-05-04-ai-1
status: experimental
level: critical
description: |
Detects the specific API endpoint and method used in the CVE-2026-7781 exploit targeting the Open5GS UDM component. This vulnerability allows for a denial of service by sending a malformed 'amf-registration-update' request to the '/udm/v1/nudm-uecm/ue-contexts' endpoint, leading to a crash of the AMF service.
author: SCW Feed Engine (AI-generated)
date: 2026-05-04
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7781/
tags:
- attack.impact
- attack.t1499
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/udm/v1/nudm-uecm/ue-contexts'
cs-method|exact:
- 'PUT'
cs-uri-query|contains:
- 'amf-registration-update'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7781 | vulnerability | CVE-2026-7781 |
| CWE-404 | weakness | CWE-404 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 05, 2026 at 02:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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