CVE-2026-105794

{"id": "CVE-2026-105794", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-105794", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-06T17:34:05.356189Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "microsoft", "product": "msquic", "versions": [{"status": "affected", "version": "< 2.4.20"}, {"status": "affected", "version": ">= 2.5.0, < 2.5.11"}, {"status": "affected", "version": ">= 2.6.0, < 2.6.1"}]}]}], "published": "2026-10-06T15:17:16.260", "references": [{"url": "https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/pull/6274", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/pull/6275", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/pull/6276", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/pull/6277", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/releases/tag/v2.4.20", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/releases/tag/v2.5.11", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/releases/tag/v2.6.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7", "source": "security-advisories@github.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-295"}]}], "descriptions": [{"lang": "en", "value": "MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust. Prior to 2.4.20, 2.5.11, and 2.6.1, MsQuic clients using the OpenSSL or QuicTLS TLS backend do not properly verify that a server certificate matches the intended target server hostname. An on-path attacker can therefore present a certificate that does not match the intended target hostname and spoof the server in a man-in-the-middle attack. The Schannel backend is not affected. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1."}], "lastModified": "2026-10-06T18:16:47.073", "sourceIdentifier": "security-advisories@github.com"}