Vulnerability Details CVE-2026-42459
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 36.7%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-42459
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cpe:2.3:a:free5gc:free5gc:1.1.1
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cpe:2.3:a:free5gc:free5gc:3.0.1
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cpe:2.3:a:free5gc:free5gc:3.0.2
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cpe:2.3:a:free5gc:free5gc:3.0.3
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cpe:2.3:a:free5gc:free5gc:3.0.4
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cpe:2.3:a:free5gc:free5gc:3.0.5
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cpe:2.3:a:free5gc:free5gc:3.0.6
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cpe:2.3:a:free5gc:free5gc:3.0.7
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cpe:2.3:a:free5gc:free5gc:3.1.0
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cpe:2.3:a:free5gc:free5gc:3.1.1
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cpe:2.3:a:free5gc:free5gc:3.2.0
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cpe:2.3:a:free5gc:free5gc:3.2.1
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cpe:2.3:a:free5gc:free5gc:3.3.0
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cpe:2.3:a:free5gc:free5gc:3.4.0
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cpe:2.3:a:free5gc:free5gc:3.4.1
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cpe:2.3:a:free5gc:free5gc:3.4.2
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cpe:2.3:a:free5gc:free5gc:3.4.3
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cpe:2.3:a:free5gc:free5gc:3.4.4
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cpe:2.3:a:free5gc:free5gc:3.4.5
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cpe:2.3:a:free5gc:free5gc:4.0.0
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cpe:2.3:a:free5gc:free5gc:4.0.1
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cpe:2.3:a:free5gc:free5gc:4.1.0