{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-35191", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-04-01T17:36:26.324Z", "datePublished": "2026-09-29T15:32:12.944Z", "dateUpdated": "2026-09-30T20:11:09.437Z"}, "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"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Ali Firas"}, {"lang": "en", "type": "reporter", "value": "Nikolas Gauder (NVIDIA)"}, {"lang": "en", "type": "remediation developer", "value": "Neil Horman"}], "datePublic": "2026-09-29T14:21:57.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: The OpenSSL QUIC server, when configured to not preform address<br>validation, can be forced to count incoming packets multiple times in its<br>unvalidated credit computation, leading to a violation of the RFC 9000<br>unvalidated connection amplification limit of 3 times the amount of data<br>received.<br><br>Impact summary: A remote attacker able to spoof packets to a server using the<br>OpenSSL QUIC implementation might use the server for an amplification of<br>a DDoS attack.<br><br>CWE: CWE-440: Expected Behavior Violation <br><br>Description: OpenSSL's QUIC stack, when operating as a server, enforces client<br>address validation (RFC 9000, Section 8), to confirm the peer address is not<br>used for a traffic amplification attack. 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If this feature is disabled on the\nserver, the QUIC stack limits the amount of server data that can be sent to 3\ntimes the amount of data received from the peer address, until such time as the\nTLS handshake is completed.\n\nThe OpenSSL QUIC server, when operating in non-validation mode, adds the\nlength of the whole datagram received to the unvalidated credit limit when\nprocessing each QUIC packet in the datagram. 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{"affected": [{"affectedData": [{"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"}]}], "source": "openssl-security@openssl.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: The OpenSSL QUIC server, when configured to not preform address\nvalidation, can be forced to count incoming packets multiple times in its\nunvalidated credit computation, leading to a violation of the RFC 9000\nunvalidated connection amplification limit of 3 times the amount of data\nreceived.\n\nImpact summary: A remote attacker able to spoof packets to a server using the\nOpenSSL QUIC implementation might use the server for an amplification of\na DDoS attack.\n\nCWE: CWE-440: Expected Behavior Violation \n\nDescription: OpenSSL's QUIC stack, when operating as a server, enforces client\naddress validation (RFC 9000, Section 8), to confirm the peer address is not\nused for a traffic amplification attack. If this feature is disabled on the\nserver, the QUIC stack limits the amount of server data that can be sent to 3\ntimes the amount of data received from the peer address, until such time as the\nTLS handshake is completed.\n\nThe OpenSSL QUIC server, when operating in non-validation mode, adds the\nlength of the whole datagram received to the unvalidated credit limit when\nprocessing each QUIC packet in the datagram. A remote peer may,\nafter establishing a connection with an initial client hello frame, send a\nsubsequent datagram containing multiple QUIC packets, leading the server to\naccount the entire datagram length for each packet in the datagram, resulting\nin the server believing that the peer has sent more data than it actually has,\nthereby violating the 3x amplification limit mandated by the RFC.\n\nFIPS impact: no\nAs the QUIC stack lives outside the FIPS module boundary, no FIPS modules\nare affected by this CVE."}], "id": "CVE-2026-35191", "lastModified": "2026-09-30T21:17:10.617", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35191", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-30T19:35:19.683843Z", "version": "2.0.3"}}]}, "published": "2026-09-29T16:17:07.490", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/0fe4442d4f8ea3af8a174046dae176e0d4717239"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/2de4c35fb13fc58f43fd8dc1d261700472ce72e5"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/e44292e58b090014232ef75bd400393851b24d1a"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260929.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-440"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{"bugzilla": {"description": "openssl: openssl: Traffic amplification Denial of Service via QUIC packet over-accounting", "id": "2543257", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543257"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-358", "details": ["A flaw was found in OpenSSL. This vulnerability allows a remote attacker to abuse the server to amplify network traffic in a Denial of Service (DoS) attack. When the server is configured without client address validation, incoming datagrams containing multiple QUIC packets cause the server to calculate credit limits incorrectly by adding the total datagram size for each packet. Consequently, the server exceeds standard rate limits and transmits excessive response data to spoofed target addresses."], "name": "CVE-2026-35191", "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", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "ovmf", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "shim-signed", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "mingw-openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "compat-openssl11", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openssl3", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "unbound", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Fix deferred", "package_name": "jbcs-httpd24-openssl", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "openvox-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "puppet-agent", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-09-29T15:32:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-35191\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-35191\nhttps://github.com/openssl/openssl/commit/0fe4442d4f8ea3af8a174046dae176e0d4717239\nhttps://github.com/openssl/openssl/commit/2de4c35fb13fc58f43fd8dc1d261700472ce72e5\nhttps://github.com/openssl/openssl/commit/e44292e58b090014232ef75bd400393851b24d1a\nhttps://openssl-library.org/news/secadv/20260929.txt"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.6.0,3.6.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.5.0,3.5.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSL", "source": "cna", "vendor": "OpenSSL"}, "product": "openssl", "vendor": "openssl"}], "created": "2026-09-29T18:15:07.998240+00:00", "updated": "2026-09-30T08:45:16.733459+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}