CVE-2026-8743 Details
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.
A vulnerability exists in Open5GS versions through 2.7.6 within the AMF component, specifically in the function that handles UE context resolution for NGAP messages. The issue arises because the AMF does not verify the ownership of UE-associated connections before processing responses related to PDU session setups. This flaw allows an attacker to forge a response that redirects downlink traffic from a legitimate UE to an attacker's gNB, effectively intercepting the data. The vulnerability can be exploited remotely, and the details of the exploitation have been made public.
Users are advised to update to Open5GS version 2.7.7 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/open5gs/open5gs/ | [email protected] | Product |
| https://github.com/open5gs/open5gs/commit/5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1 | [email protected] | Patch |
| https://github.com/open5gs/open5gs/issues/4498 | [email protected] | ExploitIssue Tracking |
| https://github.com/open5gs/open5gs/pull/4553 | [email protected] | Issue TrackingPatch |
| https://vuldb.com/submit/814559 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/vuln/364330 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/vuln/364330/cti | [email protected] | Permissions RequiredVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-266 | Incorrect Privilege Assignment | [email protected] |
| CWE-285 | Improper Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| open5gs open5gs | <= 2.7.6 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 19, 2026 | Initial Analysis | [email protected] |
| May 17, 2026 | New CVE Received | [email protected] |