{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-8741", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-05-16T11:19:08.422Z", "datePublished": "2026-05-17T08:15:08.625Z", "dateUpdated": "2026-05-17T08:15:08.625Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-05-17T08:15:08.625Z"}, "title": "EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-362", "lang": "en", "description": "Race Condition"}]}], "affected": [{"vendor": "n/a", "product": "EMQX", "versions": [{"version": "6.0", "status": "affected"}, {"version": "6.1", "status": "affected"}, {"version": "6.2.0", "status": "affected"}], "cpes": ["cpe:2.3:a:emqx:emqx:*:*:*:*:*:*:*:*"], "modules": ["QoS 2 PUBLISH Packet Handler"]}], "descriptions": [{"lang": "en", "value": "A vulnerability has been found in EMQX up to 6.2.0. This affects an unknown function of the file apps/emqx/src/emqx_persistent_session_ds.erl of the component QoS 2 PUBLISH Packet Handler. Such manipulation leads to race condition. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 2.3, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P", "baseSeverity": "LOW"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 3.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R", "baseSeverity": "LOW"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 3.1, "vectorString": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R", "baseSeverity": "LOW"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 2.1, "vectorString": "AV:N/AC:H/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR"}}], "timeline": [{"time": "2026-05-16T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-05-16T02:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-05-16T13:24:18.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "CCCaaa (VulDB User)", "type": "reporter"}, {"lang": "en", "value": "VulDB CNA Team", "type": "coordinator"}], "references": [{"url": "https://vuldb.com/vuln/364329", "name": "VDB-364329 | EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition", "tags": ["vdb-entry"]}, {"url": "https://vuldb.com/vuln/364329/cti", "name": "VDB-364329 | CTI Indicators (IOB, IOC, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/submit/809931", "name": "Submit #809931 | EMQX EMQX Broker EMQX 6.1.0 (confirmed) Race Condition", "tags": ["third-party-advisory"]}, {"url": "https://github.com/Pathfind-tama/Report_EMQX_MQTT", "tags": ["related"]}, {"url": "https://github.com/Pathfind-tama/Report_EMQX_MQTT/blob/main/MQTT%20QoS%202%20Message%20Duplication%20in%20Persistent%20Sessions.md", "tags": ["exploit"]}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been found in EMQX up to 6.2.0. This affects an unknown function of the file apps/emqx/src/emqx_persistent_session_ds.erl of the component QoS 2 PUBLISH Packet Handler. Such manipulation leads to race condition. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure."}], "id": "CVE-2026-8741", "lastModified": "2026-05-17T09:16:35.013", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 2.1, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:H/Au:S/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 1.3, "baseSeverity": "LOW", "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/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"}]}, "published": "2026-05-17T09:16:35.013", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/Pathfind-tama/Report_EMQX_MQTT"}, {"source": "cna@vuldb.com", "url": "https://github.com/Pathfind-tama/Report_EMQX_MQTT/blob/main/MQTT%20QoS%202%20Message%20Duplication%20in%20Persistent%20Sessions.md"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/809931"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/364329"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/364329/cti"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "cna@vuldb.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.2.0"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "EMQX", "source": "cna", "vendor": "n/a"}, "product": "emqx", "vendor": "emqx"}], "created": "2026-05-17T11:00:11.933353+00:00", "updated": "2026-05-17T11:00:12.719651+00:00", "vendors": ["emqx", "emqx$PRODUCT$emqx"]}