{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-41135", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-17T12:59:15.738Z", "datePublished": "2026-04-21T23:49:19.659Z", "dateUpdated": "2026-04-22T14:19:58.909Z"}, "containers": {"cna": {"title": "free5GC PCF: Memory Leak via CORS Middleware Registration in HTTP Handler Leads to Denial of Service", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp"}, {"name": "https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16"}], "affected": [{"vendor": "free5gc", "product": "pcf", "versions": [{"version": "< 1.4.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-21T23:49:19.659Z"}, "descriptions": [{"lang": "en", "value": "free5GC UDR is the Policy Control Function (PCF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. A memory leak vulnerability in versions prior to 1.4.3 allows any unauthenticated attacker with network access to the PCF SBI interface to cause uncontrolled memory growth by sending repeated HTTP requests to the OAM endpoint. The root cause is a `router.Use()` call inside an HTTP handler that registers a new CORS middleware on every incoming request, permanently growing the Gin router's handler chain. This leads to progressive memory exhaustion and eventual Denial of Service of the PCF, preventing all UEs from obtaining AM and SM policies and blocking 5G session establishment. Version 1.4.3 contains a patch."}], "source": {"advisory": "GHSA-98cp-84m9-q3qp", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-22T14:19:35.605073Z", "id": "CVE-2026-41135", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-22T14:19:58.909Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.4.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pcf", "source": "cna", "vendor": "free5gc"}, "product": "pcf", "vendor": "free5gc"}], "analysis": {"en": {"generated_at": "2026-04-22T06:08:58.578350+00:00", "value": {"mitigation_remediation": ["Upgrade the PCF component to version 1.4.3 or later, which removes the repetitive middleware registration and restores normal memory usage.", "Restart the PCF service after the upgrade to ensure the new code is active.", "If an upgrade cannot be performed immediately, limit traffic to the OAM endpoint by applying rate\u2011limiting or firewall rules to reduce the request rate from external sources."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Vendors: free5gc:pcf. All releases prior to version 1.4.3 are vulnerable. These versions can be found in the free5GC project's PCF component. The vulnerability was discovered in the open\u2011source PCF implementation; the fixed code was shipped in release 1.4.3.", "description_and_impact": "Free5GC PCF suffers a memory\u2011leak flaw caused by registering a new CORS middleware on every request to the OAM endpoint. The leak grows the Gin router handler chain without bounds, eventually exhausting system memory and rendering the PCF incapable of delivering AM and SM policies. Because the PCF refuses to provide these policies, UEs cannot establish 5G sessions, effectively denying network service to all users.", "risk_and_exploitability": "CVSS score 7.5 signifies high impact; EPSS not available, and it is not listed in KEV, implying no known widespread exploitation. The flaw can be triggered by any unauthenticated attacker who can reach the PCF's SBI interface, making the vulnerability highly actionable. When an attacker repeatedly sends requests, the PCF can be pushed into a DoS state quickly, because the attack does not require privileged access and relies on a simple HTTP interface."}}}}, "created": "2026-04-22T02:00:04.888971+00:00", "updated": "2026-04-22T06:15:10.413372+00:00", "vendors": ["free5gc", "free5gc$PRODUCT$pcf"]}