CVE-2026-1737

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The affected element is the function sgwc_s5c_handle_create_bearer_request of the file /src/sgwc/s5c-handler.c of the component CreateBearerRequest Handler. Performing a manipulation results in reachable assertion. Remote exploitation of the attack is possible. The exploit is now public and may be used. To fix this issue, it is recommended to deploy a patch. The issue report is flagged as already-fixed."}, {"lang": "es", "value": "Una vulnerabilidad fue detectada en Open5GS hasta la versi\u00f3n 2.7.6. El elemento afectado es la funci\u00f3n sgwc_s5c_handle_create_bearer_request del archivo /src/sgwc/s5c-handler.c del componente CreateBearerRequest Handler. Realizar una manipulaci\u00f3n resulta en una aserci\u00f3n alcanzable. La explotaci\u00f3n remota del ataque es posible. El exploit ahora es p\u00fablico y puede ser utilizado. Para solucionar este problema, se recomienda desplegar un parche. El informe del problema est\u00e1 marcado como ya solucionado."}], "id": "CVE-2026-1737", "lastModified": "2026-06-17T10:16:25.553", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-1737", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-02T16:13:03.639482Z", "version": "2.0.3"}}]}, "published": "2026-02-02T02:16:10.457", "references": [{"source": "cna@vuldb.com", "tags": ["Product"], "url": "https://github.com/open5gs/open5gs/"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4271"}, {"source": "cna@vuldb.com", "tags": ["Issue Tracking"], "url": "https://github.com/open5gs/open5gs/issues/4271#event-21968630023"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4271#issue-3795147720"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/?ctiid.343636"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?id.343636"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?submit.741192"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T00:48:57.550224+00:00", "value": {"mitigation_remediation": ["Apply the official Open5GS patch that fixes the assertion in the sgwc_s5c_handle_create_bearer_request function.", "If a patch is not yet available, upgrade to the newest Open5GS release that contains the fix or apply the source\u2011level patch provided by the project.", "Configure network controls or firewall rules to restrict access to the S5c interface to trusted peers until a secure version is deployed."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Open5GS implementations up to and including version 2.7.6 are affected. The flaw resides in the sgwc_s5c_handle_create_bearer_request component, which processes CreateBearerRequest messages exchanged over the S5c interface.", "description_and_impact": "The vulnerability is an assertion failure in the CreateBearerRequest handler of Open5GS. When a specially crafted request is processed, the assertion is triggered, causing the system to terminate or become unstable. This can lead to a denial\u2011of\u2011service condition for the affected control plane instance, allowing a remote attacker to interrupt network service for connected users.", "risk_and_exploitability": "The vulnerability carries a CVSS base score of 6.9 and an EPSS score below 1%, indicating a low but non\u2011zero likelihood of exploitation. Although it is not listed in CISA\u2019s KEV catalogue, the issue has a publicly available exploit. The attack likely proceeds over the network by sending a malformed CreateBearerRequest to the Open5GS instance, exploiting the assertion to crash the process."}}}}, "created": "2026-02-02T09:26:13.161607+00:00", "updated": "2026-04-18T01:00:11.622829+00:00", "vendors": ["open5gs", "open5gs$PRODUCT$open5gs"]}