CVE-2026-8743 | THREATINT

Description

A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The patch is named 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1. It is suggested to install a patch to address this issue.

PUBLISHED Reserved 2026-05-16 | Published 2026-05-17 | Updated 2026-05-18 | Assigner VulDB

MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

MEDIUM: 6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

MEDIUM: 6.3CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

6.5AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C

Problem types

Improper Authorization

Incorrect Privilege Assignment

Timeline

2026-05-16:	Advisory disclosed
2026-05-16:	VulDB entry created
2026-05-17:	VulDB entry last update

Credits

Seungjoon Na (ICSR_KMU) finder

Jinha Kim (ICSR_KMU) finder

Seungjoon Na (VulDB User) reporter

Seungjoon Na (VulDB User) analyst

References

vuldb.com/vuln/364330 (VDB-364330 | Open5GS AMF/MME context.c ran_ue_find_by_amf_ue_ngap_id improper authorization) vdb-entry technical-description

vuldb.com/vuln/364330/cti (VDB-364330 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/814559 (Submit #814559 | Open5GS 2.7.6 Incorrect Authorization) third-party-advisory

github.com/open5gs/open5gs/issues/4498 exploit issue-tracking

github.com/open5gs/open5gs/pull/4553 issue-tracking patch

github.com/...ommit/5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1 patch

github.com/open5gs/open5gs/ product

cve.org (CVE-2026-8743)

nvd.nist.gov (CVE-2026-8743)

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