CVE-2026-27642
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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4Tags
Description
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.
Analysis
Remote attackers can inject control characters into the SUPI parameter of free5GC UDM versions up to 1.4.1, causing URL parsing failures that leak sensitive system error details and enable service fingerprinting. Public exploit code exists for this vulnerability affecting the Nudm_UEAU service across all vulnerable deployments. …
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Remediation
Within 24 hours: Identify all systems running affected free5GC UDM versions and isolate them from production if patching cannot be completed immediately. Within 7 days: Apply the available vendor patch to all UDM instances and conduct post-patch validation testing. …
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