{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-102599", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-29T14:18:02.920Z", "datePublished": "2026-10-13T19:05:10.870Z", "dateUpdated": "2026-10-17T00:39:46.378Z"}, "containers": {"cna": {"title": "Socket.IO: Engine.IO Protocol Revision Mismatch DoS", "problemTypes": [{"descriptions": [{"cweId": "CWE-248", "lang": "en", "description": "CWE-248: Uncaught Exception", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv"}, {"name": "https://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf9b4729", "tags": ["x_refsource_MISC"], "url": "https://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf9b4729"}, {"name": "https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.10", "tags": ["x_refsource_MISC"], "url": "https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.10"}], "affected": [{"vendor": "socketio", "product": "socket.io", "versions": [{"version": ">= 6.6.0, < 6.6.10", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-13T19:05:10.870Z"}, "descriptions": [{"lang": "en", "value": "Socket.IO enables bidirectional and low-latency communication for every platform. From Engine.IO 6.6.0 until 6.6.10, a transport upgrade can independently derive an Engine.IO protocol revision from the upgrade request instead of enforcing the revision stored on the existing session. A malicious client can establish a valid session and send an upgrade request with a different or omitted EIO query parameter, attaching a transport with incompatible parser and heartbeat behavior. A crafted heartbeat packet can then trigger an uncaught exception and terminate the Node.js process, including when Engine.IO v3 compatibility is disabled because an omitted EIO value is interpreted as revision 3 on the affected path. This issue is fixed in Engine.IO 6.6.10."}], "source": {"advisory": "GHSA-2gc4-cqfq-p2gv", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-17T00:39:37.132946Z", "id": "CVE-2026-102599", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-17T00:39:46.378Z"}}]}}

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{"bugzilla": {"description": "engine.io: engine.io: Denial of Service via protocol revision mismatch during transport upgrade", "id": "2551068", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2551068"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-248", "details": ["A flaw was found in engine.io. A remote attacker can cause a Denial of Service (DoS) by establishing a valid session and sending a transport upgrade request with a mismatched or omitted protocol revision parameter. This discrepancy causes the server to attach incompatible communication handlers, allowing a subsequent crafted heartbeat packet to trigger an unhandled error and crash the application process."], "name": "CVE-2026-102599", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-gaudi-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-rocm-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.2", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-13T19:05:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-102599\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-102599\nhttps://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf9b4729\nhttps://github.com/socketio/socket.io/releases/tag/engine.io@6.6.10\nhttps://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv"], "threat_severity": "Important"}