{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-123612", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-06T01:02:39.794Z", "datePublished": "2026-11-08T01:38:36.873Z", "dateUpdated": "2026-11-08T01:38:36.873Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-08T01:38:36.873Z"}, "datePublic": "2026-10-14T00:00:00.000Z", "title": "rustls 0.23.44 and 0.23.45 ECH Rejection Application Data Disclosure", "descriptions": [{"lang": "en", "value": "rustls 0.23.44 and 0.23.45 contain an information disclosure vulnerability that sends application data buffered before the handshake completes to the client-facing server when Encrypted Client Hello is rejected. Because start_traffic() queues plaintext from ClientConnection::writer() before sending the ech_required alert, the authenticated public_name server receives data intended for the inner server."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Incorrect Behavior Order", "cweId": "CWE-696", "type": "CWE"}]}], "affected": [{"vendor": "rustls", "product": "rustls", "defaultStatus": "unaffected", "packageURL": "pkg:cargo/rustls", "versions": [{"version": "0.23.44", "status": "affected", "versionType": "semver", "lessThan": "0.23.46"}, {"version": "0.23.46", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:rustls_project:rustls:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.23.44", "versionEndExcluding": "0.23.46"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 4.6, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseScore": 2.3, "baseSeverity": "LOW"}}], "references": [{"url": "https://github.com/rustls/rustls/security/advisories/GHSA-vp88-798v-h67f", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-vp88-798v-h67f)"}, {"name": "VulnCheck Advisory: rustls 0.23.44 and 0.23.45 ECH Rejection Application Data Disclosure", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/rustls-0.23.44-and-0.23.45-ech-rejection-application-data-disclosure"}], "x_generator": {"engine": "vulncheck-endgame"}}}}