CVE-2026-40343

free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.2, a fail-open request handling flaw in the UDR service causes the `/nudr-dr/v2/policy-data/subs-to-notify` POST handler to continue processing requests even after request body retrieval or deserialization errors. This may allow unintended creation of Policy Data notification subscriptions with invalid, empty, or partially processed input, depending on downstream processor behavior. As of time of publication, a patched version is not available.

CVSS v3 5.8 MEDIUM

5.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/security/advisories/GHSA-jwch-w7wh-gqjm	Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:free5gc:free5gc::::::::
	cpe:2.3:a:free5gc:udr::::::go::*

History

26 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) free5GC UDR es el repositorio de datos de usuario (UDR) para free5GC, un proyecto de código abierto para redes móviles de quinta generación (5G). En versiones hasta la 1.4.2 inclusive, una falla de manejo de solicitudes de tipo fail-open en el servicio UDR provoca que el gestor POST de “/nudr-dr/v2/policy-data/subs-to-notify” continúe procesando solicitudes incluso después de errores de recuperación del cuerpo de la solicitud o de deserialización. Esto puede permitir la creación no intencionada de suscripciones de notificación de Datos de Política con entrada inválida, vacía o parcialmente procesada, dependiendo del comportamiento del procesador posterior. En el momento de la publicación, una versión parcheada no está disponible.

Information

Published : 2026-04-22 00:16

Updated : 2026-10-26 22:10

NVD link : CVE-2026-40343

Mitre link : CVE-2026-40343

CVE.ORG link : CVE-2026-40343

JSON object : View

Products Affected

free5gc

free5gc
udr

CWE

CWE-754

Improper Check for Unusual or Exceptional Conditions

{"id": "CVE-2026-40343", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40343", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-22T13:12:18.363846Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "free5gc", "product": "udr", "versions": [{"status": "affected", "version": "<= 1.4.2"}]}]}], "published": "2026-04-22T00:16:27.670", "references": [{"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-jwch-w7wh-gqjm", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-754"}]}], "descriptions": [{"lang": "en", "value": "free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.2, a fail-open request handling flaw in the UDR service causes the `/nudr-dr/v2/policy-data/subs-to-notify` POST handler to continue processing requests even after request body retrieval or deserialization errors. This may allow unintended creation of Policy Data notification subscriptions with invalid, empty, or partially processed input, depending on downstream processor behavior. As of time of publication, a patched version is not available."}, {"lang": "es", "value": "free5GC UDR es el repositorio de datos de usuario (UDR) para free5GC, un proyecto de c\u00f3digo abierto para redes m\u00f3viles de quinta generaci\u00f3n (5G). En versiones hasta la 1.4.2 inclusive, una falla de manejo de solicitudes de tipo fail-open en el servicio UDR provoca que el gestor POST de \u201c/nudr-dr/v2/policy-data/subs-to-notify\u201d contin\u00fae procesando solicitudes incluso despu\u00e9s de errores de recuperaci\u00f3n del cuerpo de la solicitud o de deserializaci\u00f3n. Esto puede permitir la creaci\u00f3n no intencionada de suscripciones de notificaci\u00f3n de Datos de Pol\u00edtica con entrada inv\u00e1lida, vac\u00eda o parcialmente procesada, dependiendo del comportamiento del procesador posterior. En el momento de la publicaci\u00f3n, una versi\u00f3n parcheada no est\u00e1 disponible."}], "lastModified": "2026-10-26T22:10:00.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AA20AB40-343A-4B48-9B29-2A700DEC58B8", "versionEndIncluding": "4.2.1"}, {"criteria": "cpe:2.3:a:free5gc:udr:*:*:*:*:*:go:*:*", "vulnerable": true, "matchCriteriaId": "0D45904F-F7CA-47A1-A1E3-D23FCE2D7878", "versionEndIncluding": "1.4.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}