CVE-2026-8741

{"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": "2026-05-18T17:53:07.926Z"}, "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"]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-18T16:43:33.259533Z", "id": "CVE-2026-8741", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"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": "2026-05-18T17:53:07.926Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition", "credits": [{"lang": "en", "type": "reporter", "value": "CCCaaa (VulDB User)"}, {"lang": "en", "type": "coordinator", "value": "VulDB CNA Team"}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 2.3, "baseSeverity": "LOW", "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"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 3.1, "baseSeverity": "LOW", "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"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 3.1, "baseSeverity": "LOW", "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"}}, {"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"}}], "affected": [{"cpes": ["cpe:2.3:a:emqx:emqx:*:*:*:*:*:*:*:*"], "vendor": "n/a", "modules": ["QoS 2 PUBLISH Packet Handler"], "product": "EMQX", "versions": [{"status": "affected", "version": "6.0"}, {"status": "affected", "version": "6.1"}, {"status": "affected", "version": "6.2.0"}]}], "timeline": [{"lang": "en", "time": "2026-05-16T00:00:00.000Z", "value": "Advisory disclosed"}, {"lang": "en", "time": "2026-05-16T02:00:00.000Z", "value": "VulDB entry created"}, {"lang": "en", "time": "2026-05-16T13:24:18.000Z", "value": "VulDB entry last update"}], "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"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "Race Condition"}]}], "providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-05-17T08:15:08.625Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-8741", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-18T16:43:33.259533Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-05-18T16:43:37.263Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-8741", "state": "PUBLISHED", "dateUpdated": "2026-05-17T08:15:08.625Z", "dateReserved": "2026-05-16T11:19:08.422Z", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "datePublished": "2026-05-17T08:15:08.625Z", "assignerShortName": "VulDB"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:emqx:emqx:*:*:*:*:*:*:*:*"], "modules": ["QoS 2 PUBLISH Packet Handler"], "product": "EMQX", "vendor": "n/a", "versions": [{"status": "affected", "version": "6.0"}, {"status": "affected", "version": "6.1"}, {"status": "affected", "version": "6.2.0"}]}], "source": "cna@vuldb.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:emqx:emqx:*:*:*:*:*:*:*:*", "matchCriteriaId": "E5174349-D7AF-4064-879C-B980604DB41C", "versionEndIncluding": "6.2.0", "versionStartIncluding": "5.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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."}, {"lang": "es", "value": "Una vulnerabilidad ha sido encontrada en EMQX hasta 6.2.0. Esto afecta a una funci\u00f3n desconocida del archivo apps/emqx/src/emqx_persistent_session_ds.erl del componente Gestor de Paquetes PUBLISH QoS 2. Dicha manipulaci\u00f3n conduce a condici\u00f3n de carrera. El ataque puede ser realizado desde remoto. Un alto nivel de complejidad est\u00e1 asociado con este ataque. La explotabilidad se reporta como dif\u00edcil. El exploit ha sido divulgado al p\u00fablico y puede ser usado. El proveedor fue contactado tempranamente sobre esta divulgaci\u00f3n."}], "id": "CVE-2026-8741", "lastModified": "2026-11-11T20:10:00.273", "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": "Secondary"}], "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-8741", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-18T16:43:33.259533Z", "version": "2.0.3"}}]}, "published": "2026-05-17T09:16:35.013", "references": [{"source": "cna@vuldb.com", "tags": ["Third Party Advisory"], "url": "https://github.com/Pathfind-tama/Report_EMQX_MQTT"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://github.com/Pathfind-tama/Report_EMQX_MQTT/blob/main/MQTT%20QoS%202%20Message%20Duplication%20in%20Persistent%20Sessions.md"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/submit/809931"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/vuln/364329"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/vuln/364329/cti"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

{}

{"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"]}