CVE-2026-47071

Uncontrolled Resource Consumption vulnerability in benoitc hackney allows Flooding. The SOCKS5 transport in src/hackney_socks5.erl correctly applies the caller-supplied timeout to the SOCKS5 negotiation phase, but then upgrades the connection to TLS using the two-argument form ssl:connect/2, which defaults to an infinite timeout. The Timeout value is in scope at the call site but is not forwarded. A hostile SOCKS5 proxy that completes the SOCKS5 handshake normally and then goes silent (or sends a partial TLS ServerHello and stalls) will cause the connecting process to block indefinitely, regardless of the connect_timeout or recv_timeout options supplied by the caller. This issue affects hackney: from 0.10.0 before 4.0.1.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-47071.html	Patch Third Party Advisory
https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae	Patch
https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxr	Exploit Patch Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-47071	Patch Third Party Advisory
https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxr	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-25 15:16

Updated : 2026-07-24 10:10

NVD link : CVE-2026-47071

Mitre link : CVE-2026-47071

CVE.ORG link : CVE-2026-47071

JSON object : View

Products Affected

benoitc

hackney

CWE

CWE-400

Uncontrolled Resource Consumption

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The SOCKS5 transport in src/hackney_socks5.erl correctly applies the caller-supplied timeout to the SOCKS5 negotiation phase, but then upgrades the connection to TLS using the two-argument form ssl:connect/2, which defaults to an infinite timeout. The Timeout value is in scope at the call site but is not forwarded. A hostile SOCKS5 proxy that completes the SOCKS5 handshake normally and then goes silent (or sends a partial TLS ServerHello and stalls) will cause the connecting process to block indefinitely, regardless of the connect_timeout or recv_timeout options supplied by the caller.\n\nThis issue affects hackney: from 0.10.0 before 4.0.1."}, {"lang": "es", "value": "Una vulnerabilidad de Consumo de Recursos Incontrolado en benoitc hackney permite Inundaci\u00f3n. El transporte SOCKS5 en src/hackney_socks5.erl aplica correctamente el tiempo de espera proporcionado por el llamador a la fase de negociaci\u00f3n SOCKS5, pero luego actualiza la conexi\u00f3n a TLS usando la forma de dos argumentos ssl:connect/2, que por defecto tiene un tiempo de espera infinito. El valor de Timeout est\u00e1 en el \u00e1mbito en el sitio de la llamada pero no se reenv\u00eda. Un proxy SOCKS5 hostil que completa el handshake SOCKS5 normalmente y luego se queda en silencio (o env\u00eda un TLS ServerHello parcial y se detiene) har\u00e1 que el proceso de conexi\u00f3n se bloquee indefinidamente, independientemente de las opciones connect_timeout o recv_timeout proporcionadas por el llamador.\n\nEste problema afecta a hackney: desde 0.10.0 antes de 4.0.1."}], "lastModified": "2026-07-24T10:10:00.197", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7C34AFFA-7B8D-45F0-B4BA-A3242DE2E532", "versionEndExcluding": "4.0.1", "versionStartIncluding": "0.10.0"}], "operator": "OR"}]}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}