Open5GS up to 2.7.7 transfer-update ueContextId denial of service

Summaryinfo

A vulnerability was found in Open5GS up to 2.7.7. It has been declared as problematic. This vulnerability affects the function amf_namf_comm_handle_registration_status_update_request in the library /lib/app/ogs-init.c of the file /namf-comm/v1/ue-contexts/{ueContextId}/transfer-update. Executing a manipulation of the argument ueContextId can lead to denial of service. This vulnerability is tracked as CVE-2026-7535. The attack can be launched remotely. Moreover, an exploit is present. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability classified as problematic was found in Open5GS up to 2.7.7. This vulnerability affects the function amf_namf_comm_handle_registration_status_update_request in the library /lib/app/ogs-init.c of the file /namf-comm/v1/ue-contexts/{ueContextId}/transfer-update. The manipulation of the argument ueContextId with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-7535. The exploitation appears to be easy. The attack can be initiated remotely. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1499.

It is possible to download the exploit 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.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Open5GS

Version

• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7

Website

• Product: https://github.com/open5gs/open5gs/

CPE 2.3info

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CPE 2.2info

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Submitinfo

Accepted

• Submit #804291: Open5GS AMF V2.7.7 Denial of Service (by ZiyuLin)

Duplicate

• Submit #XXXXXX: Xxxxxxx Xxx Xx.x.x Xxxxxx Xx Xxxxxxx (by ZiyuLin)

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