CVE-2026-65623

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Because the buffer grows by one element per frame and is fully re-traversed each time, reassembly work is quadratic (O(n^2)) in the number of continuation frames.\n\nThe max_fragmented_message_size limit (default 8 MB) bounds total bytes but not frame count, and each frame can carry as little as one payload byte, so an attacker can send millions of tiny continuation frames using modest bandwidth to pin a CPU core for minutes to hours. Many concurrent connections can starve the whole server of CPU, denying service to legitimate users. 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Applications that do not upgrade any connections to WebSocket are not affected.</p>", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "1.12.1", "versionStartIncluding": "1.11.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-25T04:16:42.726Z"}}}, "cveMetadata": {"cveId": "CVE-2026-65623", "state": "PUBLISHED", "dateUpdated": "2026-07-25T04:16:42.726Z", "dateReserved": "2026-07-22T13:55:59.401Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-07-24T16:32:24.923Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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Because the buffer grows by one element per frame and is fully re-traversed each time, reassembly work is quadratic (O(n^2)) in the number of continuation frames.\n\nThe max_fragmented_message_size limit (default 8 MB) bounds total bytes but not frame count, and each frame can carry as little as one payload byte, so an attacker can send millions of tiny continuation frames using modest bandwidth to pin a CPU core for minutes to hours. Many concurrent connections can starve the whole server of CPU, denying service to legitimate users. The WebSocket read timeout does not help, because it is an idle timeout evaluated between reads and cannot preempt the synchronous reassembly work spent inside a single callback.\n\nThis issue affects bandit: from 1.11.0 before 1.12.1."}, {"lang": "es", "value": "Vulnerabilidad de complejidad algor\u00edtmica ineficiente en mtrudel bandit permite la denegaci\u00f3n de servicio remota no autenticada a trav\u00e9s del agotamiento de la CPU durante el reensamblaje de fragmentos de WebSocket.\n\nEl guardia de tama\u00f1o \u2019Elixir.Bandit.WebSocket.Connection\u2019:oversize_message?/2, llamado desde handle_frame/3 en lib/bandit/websocket/connection.ex, a\u00f1ade cada trama de continuaci\u00f3n no final a una iolist anidada a la izquierda y luego vuelve a medir todo el b\u00fafer acumulado con IO.iodata_length/1 en cada trama. Debido a que el b\u00fafer crece en un elemento por trama y se vuelve a recorrer completamente cada vez, el trabajo de reensamblaje es cuadr\u00e1tico (O(n^2)) en el n\u00famero de tramas de continuaci\u00f3n.\n\nEl l\u00edmite max_fragmented_message_size (predeterminado 8 MB) limita el total de bytes pero no el recuento de tramas, y cada trama puede transportar tan solo un byte de carga \u00fatil, por lo que un atacante puede enviar millones de peque\u00f1as tramas de continuaci\u00f3n utilizando un ancho de banda modesto para fijar un n\u00facleo de CPU durante minutos u horas. Muchas conexiones concurrentes pueden privar de CPU a todo el servidor, denegando el servicio a usuarios leg\u00edtimos. El tiempo de espera de lectura de WebSocket no ayuda, porque es un tiempo de espera inactivo evaluado entre lecturas y no puede anticipar el trabajo de reensamblaje s\u00edncrono realizado dentro de una \u00fanica devoluci\u00f3n de llamada.\n\nEste problema afecta a bandit: desde 1.11.0 antes de 1.12.1."}], "id": "CVE-2026-65623", "lastModified": "2026-10-24T13:10:00.147", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-65623", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-24T17:08:51.111665Z", "version": "2.0.3"}}]}, "published": "2026-07-24T17:17:34.107", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-65623.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/mtrudel/bandit/commit/418ef7e906192a230ddba112f7a669c87b6b0e3a"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-vg8x-66vg-5pxh"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-65623"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-vg8x-66vg-5pxh"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.11.0,1.12.1)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "bandit", "source": "cna", "vendor": "mtrudel"}, "product": "bandit", "vendor": "mtrudel"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[21612c7c7b1ce43eccd36d3af3a2299d23513667,418ef7e906192a230ddba112f7a669c87b6b0e3a)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "bandit", "source": "cna", "vendor": "mtrudel"}, "product": "bandit", "vendor": "mtrudel"}], "created": "2026-07-24T22:30:06.031357+00:00", "updated": "2026-08-03T20:00:13.006471+00:00", "vendors": ["mtrudel", "mtrudel$PRODUCT$bandit"]}