Immediate
Before a patch is released, reduce exposure immediately and only allow trusted sources to reach the affected service.
root@hackertop:~/vulnfeed/CVE-2026-7781#
CVE-2026-7781
LOW
CVE
⚠ Unpatched · Zero-day◉ PoC 公开
Lifecycle 4/7
Open5GS up to 2.7.7 amf-3gpp-access Endpoint /src/udm/nudm-handler.c udm_nudm_uecm_handle_amf_registration_update denial of service
LIFECYCLE
3.9
CVSS
Vulnerability Description
A vulnerability was found in Open5GS up to 2.7.7. It has been classified as problematic. Affected 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. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Root Cause Analysis
CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use.
Impact: This is going to have an impact on availability.
Exploit: The exploit is shared for download at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.
Countermeasure: There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Impact: This is going to have an impact on availability.
Exploit: The exploit is shared for download at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.
Countermeasure: There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Validation (PoC/EXP) - Looking for Contributors
No public PoC yet
Public validation traces already exist. Community contributors can extend them with richer reproduction content.
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Mitigation Plan - Sorted by Priority
High
Enable extra access controls, WAF/ACL, or reverse-proxy rules for Open5GS.
High
Use logs and IOCs to hunt through production traffic and confirm whether exploitation traces already exist.
Medium
Keep this issue on the watch list and follow vendor advisories, rollback notices, and new variants.
Vulnerability Lifecycle - Click each stage to inspect details
The issue has entered HackerTop VulnFeed and is now being tracked by the community.
The vulnerability has been synchronized into the platform and entered the visible triage flow.
Initial impact validation is complete based on current disclosure, technical details, and public intelligence.
A public proof path already exists for reference.
No in-the-wild exploitation has been confirmed yet, but monitoring should continue.
No vendor patch is available yet. Apply temporary mitigations first.
Reduce exposure, restrict access, and inspect logs until a permanent fix is available.
3.9
CVSS
Temp Score
3.9
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric Details
Attack Vector
Attack Vector
Network
Attack Complexity
Attack Complexity
Low
Privileges Required
Privileges Required
None
User Interaction
User Interaction
None
Confidentiality Impact
Confidentiality Impact
High
Integrity Impact
Integrity Impact
High
Availability Impact
Availability Impact
High
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CVE-2026-7781 · CVSS 3.9 · Active Threat
