Vulnerability Details CVE-2026-27642
free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, remote attackers can inject control characters (e.g., %00) into the supi parameter, triggering internal URL parsing errors (net/url: invalid control character). This exposes system-level error details and can be used for service fingerprinting. All deployments of free5GC using the UDM Nudm_UEAU service may be affected. free5gc/udm pull request 75 contains a fix for the issue. No direct workaround is available at the application level. Applying the official patch is recommended.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 45.1%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-27642
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cpe:2.3:a:free5gc:udm:1.0.0
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cpe:2.3:a:free5gc:udm:1.0.1
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cpe:2.3:a:free5gc:udm:1.0.2
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cpe:2.3:a:free5gc:udm:1.1.0
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cpe:2.3:a:free5gc:udm:1.1.1
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cpe:2.3:a:free5gc:udm:1.2.0