CVE-2026-43974

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It does not check whether the client ever sent an <tt>Upgrade</tt> or <tt>Connection: upgrade</tt> header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a <tt>gun_upgrade</tt> message to the caller and transition the entire connection to raw protocol mode.</p><p>A malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, <tt>gun_raw</tt> applies no flow control (<tt>flow=infinity</tt>) and re-arms socket <tt>active</tt> mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded <tt>gun_data</tt> messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.</p><p>This issue affects gun: from 2.0.0 before 2.4.0.</p>"}], "value": "Unexpected Status Code or Return Value vulnerability in ninenines gun (gun_http module) allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response.\n\nIn gun_http:handle_inform/8, when a 101 Switching Protocols response is received over HTTP/1.1, the function verifies only that the Upgrade header is syntactically valid and that the stream reference is a plain reference(). It does not check whether the client ever sent an Upgrade or Connection: upgrade header on the corresponding request. 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It does not check whether the client ever sent an Upgrade or Connection: upgrade header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a gun_upgrade message to the caller and transition the entire connection to raw protocol mode.\n\nA malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, gun_raw applies no flow control (flow=infinity) and re-arms socket active mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded gun_data messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.\n\nThis issue affects gun: from 2.0.0 before 2.4.0.", "supportingMedia": [{"type": "text/html", "value": "Unexpected Status Code or Return Value vulnerability in ninenines gun (<tt>gun_http</tt> module) allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response.<p>In <tt>gun_http:handle_inform/8</tt>, when a <tt>101 Switching Protocols</tt> response is received over HTTP/1.1, the function verifies only that the <tt>Upgrade</tt> header is syntactically valid and that the stream reference is a plain <tt>reference()</tt>. It does not check whether the client ever sent an <tt>Upgrade</tt> or <tt>Connection: upgrade</tt> header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a <tt>gun_upgrade</tt> message to the caller and transition the entire connection to raw protocol mode.</p><p>A malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, <tt>gun_raw</tt> applies no flow control (<tt>flow=infinity</tt>) and re-arms socket <tt>active</tt> mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded <tt>gun_data</tt> messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.</p><p>This issue affects gun: from 2.0.0 before 2.4.0.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-841", "description": "CWE-841 Improper Enforcement of Behavioral Workflow"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.4.0", "versionStartIncluding": "2.0.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-08T16:34:38.989Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43974", "state": "PUBLISHED", "dateUpdated": "2026-06-08T16:34:38.989Z", "dateReserved": "2026-05-04T18:23:25.574Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-06-08T14:12:36.957Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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It does not check whether the client ever sent an Upgrade or Connection: upgrade header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a gun_upgrade message to the caller and transition the entire connection to raw protocol mode.\n\nA malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, gun_raw applies no flow control (flow=infinity) and re-arms socket active mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded gun_data messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.\n\nThis issue affects gun: from 2.0.0 before 2.4.0."}, {"lang": "es", "value": "Una vulnerabilidad de c\u00f3digo de estado o valor de retorno inesperado en ninenines gun (m\u00f3dulo gun_http) permite a un servidor HTTP malicioso forzar al cliente a un modo de protocolo sin procesar a trav\u00e9s de una respuesta 101 Switching Protocols no solicitada.\n\nEn gun_http:handle_inform/8, cuando se recibe una respuesta 101 Switching Protocols sobre HTTP/1.1, la funci\u00f3n verifica solo que el encabezado Upgrade es sint\u00e1cticamente v\u00e1lido y que la referencia de flujo es una referencia simple(). No verifica si el cliente alguna vez envi\u00f3 un encabezado Upgrade o Connection: upgrade en la solicitud correspondiente. Debido a que esta verificaci\u00f3n est\u00e1 ausente, cualquier respuesta 101 (solicitada o no) hace que gun env\u00ede un mensaje gun_upgrade al llamador y transicione toda la conexi\u00f3n a modo de protocolo sin procesar.\n\nUn servidor HTTP malicioso o comprometido puede enviar una respuesta 101 no solicitada a cualquier solicitud HTTP/1.1, haciendo que el cliente gun abandone el encuadre HTTP para esa conexi\u00f3n. Una vez en modo sin procesar, gun_raw no aplica control de flujo (flow=infinity) y rearma el modo activo del socket despu\u00e9s de cada paquete recibido, por lo que el servidor puede inundar al cliente con bytes arbitrarios. Estos se reenv\u00edan como mensajes gun_data ilimitados al proceso propietario, agotando su buz\u00f3n y la memoria BEAM, lo que finalmente provoca el bloqueo de la VM.\n\nEste problema afecta a gun: desde 2.0.0 antes de 2.4.0."}], "id": "CVE-2026-43974", "lastModified": "2026-08-18T15:44:36.187", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "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-2026-43974", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-08T15:41:42.657559Z", "version": "2.0.3"}}]}, "published": "2026-06-08T15:16:46.870", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-43974.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/ninenines/gun/commit/5b48068c29ce5e112cb149b5857c7d4dc319a81b"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory", "Patch"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-43974"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-841"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0,2.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "gun", "source": "cna", "vendor": "ninenines"}, "product": "gun", "vendor": "ninenines"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3c2edbb8c807717e2f10520c6cf1e77a62eab2e,5b48068c29ce5e112cb149b5857c7d4dc319a81b)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "gun", "source": "cna", "vendor": "ninenines"}, "product": "gun", "vendor": "ninenines"}], "created": "2026-06-08T16:00:16.625896+00:00", "updated": "2026-06-09T08:57:09.965166+00:00", "vendors": ["ninenines", "ninenines$PRODUCT$gun"]}