{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42772", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-04-29T09:22:27.969Z", "datePublished": "2026-09-29T15:32:14.009Z", "dateUpdated": "2026-09-30T20:11:09.295Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.3", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.5", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.9", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.8", "status": "affected", "version": "3.4.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Saku0512"}, {"lang": "en", "type": "reporter", "value": "Opal Wright (Trail of Bits)"}, {"lang": "en", "type": "remediation developer", "value": "Alexandr Nedvedicky"}], "datePublic": "2026-09-29T14:21:57.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: The QUIC stream reassembly algorithm performance deteriorates<br>progressively as packets are arriving out of order. 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{"bugzilla": {"description": "openssl: openssl: Denial of Service via inefficient QUIC stream reassembly", "id": "2543249", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543249"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in OpenSSL. A remote attacker who establishes a QUIC network connection can cause a Denial of Service (DoS) by sending specially sequenced, out-of-order stream frames. Because the stream reassembly mechanism handles non-sequential data fragments inefficiently, processing these frames forces the server to consume excessive CPU resources. Consequently, an attacker can exhaust system processing capacity using minimal network bandwidth."], "name": "CVE-2026-42772", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Fix deferred", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", 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["https://www.cve.org/CVERecord?id=CVE-2026-42772\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42772\nhttps://github.com/openssl/openssl/commit/32d0ed8afe1b8c3e7ece725b44663da3d7087a09\nhttps://github.com/openssl/openssl/commit/ca8402e273af4de5b3f04fa61a0f0c02ce3ae20e\nhttps://github.com/openssl/openssl/commit/eb2becc0a4baea7f3050a247834d0e5c2ebe1773\nhttps://github.com/openssl/openssl/commit/f42ae513bbda513b3c121d54834040ee4a0eae1a\nhttps://openssl-library.org/news/secadv/20260929.txt"], "threat_severity": "Moderate"}