CVE-2026-42209

{"id": "CVE-2026-42209", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42209", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-11T15:59:23.887272Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "halfgaar", "product": "FlashMQ", "versions": [{"status": "affected", "version": "< 1.26.1"}]}]}], "published": "2026-05-08T22:16:32.103", "references": [{"url": "https://github.com/halfgaar/FlashMQ/commit/193b6e7767889511cfa8e933908ea5e6a1077a1f", "source": "security-advisories@github.com"}, {"url": "https://github.com/halfgaar/FlashMQ/issues/167", "source": "security-advisories@github.com"}, {"url": "https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-2789-vfcg-5922", "source": "security-advisories@github.com"}, {"url": "https://github.com/halfgaar/FlashMQ/issues/167", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-369"}]}], "descriptions": [{"lang": "en", "value": "FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been patched in version 1.26.1."}], "lastModified": "2026-06-17T10:47:30.937", "sourceIdentifier": "security-advisories@github.com"}