CVE-2026-42786

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The existing <tt>max_frame_size</tt> option only bounds individual frames; a peer that streams an unbounded number of continuation frames without ever setting <tt>fin=1</tt> grows BEAM heap linearly until the OS or a supervisor kills the process.</p><p>Because the accumulation happens before <tt>WebSock.handle_in/2</tt> is called, the application has no opportunity to interpose a size check. Phoenix Channels and LiveView both run over <tt>WebSock</tt> on Bandit, so a stock Phoenix application exposes this surface as soon as it accepts socket connections.</p><p>This issue affects bandit: from 0.5.0 before 1.11.0.</p>"}], "value": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion.\n\nThe fragment reassembly path in 'Elixir.Bandit.WebSocket.Connection':handle_frame/3 in lib/bandit/websocket/connection.ex appends every incoming Continuation{fin: false} frame's payload to a per-connection iolist with no cumulative size cap. The existing max_frame_size option only bounds individual frames; a peer that streams an unbounded number of continuation frames without ever setting fin=1 grows BEAM heap linearly until the OS or a supervisor kills the process.\n\nBecause the accumulation happens before WebSock.handle_in/2 is called, the application has no opportunity to interpose a size check. 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The existing max_frame_size option only bounds individual frames; a peer that streams an unbounded number of continuation frames without ever setting fin=1 grows BEAM heap linearly until the OS or a supervisor kills the process.\n\nBecause the accumulation happens before WebSock.handle_in/2 is called, the application has no opportunity to interpose a size check. 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{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Bandit.WebSocket.Connection'"], "packageName": "bandit", "packageURL": "pkg:hex/bandit", "product": "bandit", "programFiles": ["lib/bandit/websocket/connection.ex"], "programRoutines": [{"name": "'Elixir.Bandit.WebSocket.Connection':handle_frame/3"}], "repo": "https://github.com/mtrudel/bandit", "vendor": "mtrudel", "versions": [{"lessThan": "1.11.0", "status": "affected", "version": "0.5.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Bandit.WebSocket.Connection'"], "packageName": "mtrudel/bandit", "packageURL": "pkg:github/mtrudel/bandit", "product": "bandit", "programFiles": ["lib/bandit/websocket/connection.ex"], "programRoutines": [{"name": "'Elixir.Bandit.WebSocket.Connection':handle_frame/3"}], "repo": "https://github.com/mtrudel/bandit", "vendor": "mtrudel", "versions": [{"lessThan": "21612c7c7b1ce43eccd36d3af3a2299d23513667", "status": "affected", "version": "8909391f486d42138c5308410bc5ea49a65f4d46", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion.\n\nThe fragment reassembly path in 'Elixir.Bandit.WebSocket.Connection':handle_frame/3 in lib/bandit/websocket/connection.ex appends every incoming Continuation{fin: false} frame's payload to a per-connection iolist with no cumulative size cap. The existing max_frame_size option only bounds individual frames; a peer that streams an unbounded number of continuation frames without ever setting fin=1 grows BEAM heap linearly until the OS or a supervisor kills the process.\n\nBecause the accumulation happens before WebSock.handle_in/2 is called, the application has no opportunity to interpose a size check. Phoenix Channels and LiveView both run over WebSock on Bandit, so a stock Phoenix application exposes this surface as soon as it accepts socket connections.\n\nThis issue affects bandit: from 0.5.0 before 1.11.0."}, {"lang": "es", "value": "Vulnerabilidad de Asignaci\u00f3n de Recursos Sin L\u00edmites o Limitaci\u00f3n (Throttling) en mtrudel bandit permite la denegaci\u00f3n de servicio remota no autenticada mediante el agotamiento de la memoria.\n\nLa ruta de reensamblaje de fragmentos en \u2019Elixir.Bandit.WebSocket.Connection\u2019:handle_frame/3 en lib/bandit/websocket/connection.ex a\u00f1ade la carga \u00fatil de cada trama Continuation{fin: false} entrante a una iolist por conexi\u00f3n sin l\u00edmite de tama\u00f1o acumulativo. La opci\u00f3n existente max_frame_size solo limita las tramas individuales; un par que transmite un n\u00famero ilimitado de tramas de continuaci\u00f3n sin establecer nunca fin=1 hace crecer el heap de BEAM linealmente hasta que el sistema operativo o un supervisor mata el proceso.\n\nDebido a que la acumulaci\u00f3n ocurre antes de que se llame a WebSock.handle_in/2, la aplicaci\u00f3n no tiene oportunidad de interponer una verificaci\u00f3n de tama\u00f1o. Phoenix Channels y LiveView se ejecutan sobre WebSock en Bandit, por lo que una aplicaci\u00f3n Phoenix est\u00e1ndar expone esta superficie tan pronto como acepta conexiones de socket.\n\nEste problema afecta a bandit: desde 0.5.0 antes de 1.11.0."}], "id": "CVE-2026-42786", "lastModified": "2026-10-26T22:10:00.163", "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-2026-42786", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-02T01:15:58.376139Z", "version": "2.0.3"}}]}, "published": "2026-05-01T21:16:17.347", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-42786.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/mtrudel/bandit/commit/21612c7c7b1ce43eccd36d3af3a2299d23513667"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-pf94-94m9-536p"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-42786"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-pf94-94m9-536p"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{"bugzilla": {"description": "bandit: Bandit: Denial of Service via uncontrolled memory growth in WebSocket connections", "id": "2464587", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464587"}, "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-770", "details": ["A flaw was found in bandit. A remote, unauthenticated attacker can exploit an Allocation of Resources Without Limits or Throttling vulnerability in the fragment reassembly path of the WebSocket connection handling. This allows the attacker to send an unbounded number of continuation frames, leading to uncontrolled memory growth and ultimately a denial of service (DoS) by exhausting system resources."], "name": "CVE-2026-42786", "public_date": "2026-05-01T20:34:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-42786\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42786\nhttps://cna.erlef.org/cves/CVE-2026-42786.html\nhttps://github.com/mtrudel/bandit/commit/21612c7c7b1ce43eccd36d3af3a2299d23513667\nhttps://github.com/mtrudel/bandit/security/advisories/GHSA-pf94-94m9-536p\nhttps://osv.dev/vulnerability/EEF-CVE-2026-42786"], "statement": "This IMPORTANT DoS vulnerability in Bandit's WebSocket handling allows unauthenticated memory exhaustion via unbounded continuation frames. Unlike CVE-2026-39804, this affects stock Phoenix and LiveView applications since accumulation happens before WebSock.handle_in is called. Impact is high availability loss. Affects Bandit versions 0.5.0 to before 1.11.0.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.5.0,1.11.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "bandit", "source": "cna", "vendor": "mtrudel"}, "product": "bandit", "vendor": "mtrudel"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8909391f486d42138c5308410bc5ea49a65f4d46,1.11.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "bandit", "source": "cna", "vendor": "mtrudel"}, "product": "bandit", "vendor": "mtrudel"}], "created": "2026-05-01T23:00:14.018237+00:00", "updated": "2026-05-04T16:07:20.353069+00:00", "vendors": ["mtrudel", "mtrudel$PRODUCT$bandit"]}